Arnaldo Carvalho de Melo
86a5e0c202
perf tools: Remove sys/ioctl.h from util.h
...
Not needed in this header, added to the places that need 'struct
winsize' and the ioctl defines.
Link: http://lkml.kernel.org/n/tip-2pznlli3146y4242otlcm70m@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-04-24 13:43:32 -03:00
Arnaldo Carvalho de Melo
58db1d6e7d
perf tools: Move units conversion/formatting routines to separate object
...
Out of util.h, to disentangle it a bit more.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-vpksyj3w5fk9t8s6mxmkajyr@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-04-20 13:22:44 -03:00
Arnaldo Carvalho de Melo
9607ad3a63
perf tools: Add signal.h to places using its definitions
...
And remove it from util.h, disentangling it a bit more.
Link: http://lkml.kernel.org/n/tip-2zg9s5nx90yde64j3g4z2uhk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-04-20 13:22:43 -03:00
Arnaldo Carvalho de Melo
a43783aeec
perf tools: Include errno.h where needed
...
Removing it from util.h, part of an effort to disentangle the includes
hell, that makes changes to util.h or something included by it to cause
a complete rebuild of the tools.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-ztrjy52q1rqcchuy3rubfgt2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-04-19 13:01:51 -03:00
Arnaldo Carvalho de Melo
fd20e8111c
perf tools: Including missing inttypes.h header
...
Needed to use the PRI[xu](32,64) formatting macros.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-wkbho8kaw24q67dd11q0j39f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-04-19 13:01:46 -03:00
Arnaldo Carvalho de Melo
4738ca30b4
perf evlist: Clarify a bit the use of perf_mmap->refcnt
...
This is an odd refcount use case, so add some more comments to help
understand that when it hits zero it really means that the mmap()ed area
(on a perf_event_open() returned fd) has been munmap()ed.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Elena Reshetova <elena.reshetova@intel.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/r/20170223162344.GD3595@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-03-03 19:07:16 -03:00
Elena Reshetova
25a3720cf4
perf evlist: Convert perf_map.refcnt from atomic_t to refcount_t
...
The refcount_t type and corresponding API should be used instead of
atomic_t when the variable is used as a reference counter.
This allows to avoid accidental refcounter overflows that might lead to
use-after-free situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com >
Signed-off-by: David Windsor <dwindsor@gmail.com >
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com >
Signed-off-by: Kees Kook <keescook@chromium.org >
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com >
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com >
Cc: Andrew Morton <akpm@linux-foundation.org >
Cc: David Windsor <dwindsor@gmail.com >
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
Cc: Hans Liljestrand <ishkamiel@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Kees Kook <keescook@chromium.org >
Cc: Mark Rutland <mark.rutland@arm.com >
Cc: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: alsa-devel@alsa-project.org
Link: http://lkml.kernel.org/r/1487691303-31858-8-git-send-email-elena.reshetova@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-03-03 19:07:15 -03:00
Jiri Olsa
0c5824498e
perf record: Add switch-output size warning
...
Adding switch-output size warning if the requested
size of lower than the wakeup ring buffer size.
$ perf record --switch-output=1K ls
WARNING: switch-output data size lower than wakeup kernel buffer size (258K) expect bigger perf.data sizes
...
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Suggested-and-Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/r/1483955520-29063-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-01-11 16:48:02 -03:00
Jiri Olsa
9808143ba2
perf tools: Add unit_number__scnprintf function
...
Add unit_number__scnprintf function to display size units and use it in
-m option info message.
Before:
$ perf record -m 10M ls
rounding mmap pages size to 16777216 bytes (4096 pages)
...
After:
$ perf record -m 10M ls
rounding mmap pages size to 16M (4096 pages)
...
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/r/1483955520-29063-2-git-send-email-jolsa@kernel.org
[ Rename it to unit_number__scnprintf for consistency ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-01-11 16:48:01 -03:00
Soramichi Akiyama
e978be9ea2
perf evlist: Fix typo in perf_evlist__start_workload()
...
This patch fixes a typo: s/enable to/unable to/
Signed-off-by: Soramichi AKIYAMA <akiyama@m.soramichi.jp >
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com >
Cc: Namhyung Kim <namhyung.kim@lge.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Fixes: bcf3145fbehttp://lkml.kernel.org/r/20170110200006.e1f7a766b4faf1f107ae2e1b@m.soramichi.jp
[ Wasn't applying, fixed it up by hand, added Fixes: tag ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2017-01-11 16:48:01 -03:00
Arnaldo Carvalho de Melo
18ef15c675
perf tools: Experiment with cppcheck
...
Experimenting a bit using cppcheck[1], a static checker brought to my
attention by Colin, reducing the scope of some variables, reducing the
line of source code lines in the process:
$ cppcheck --enable=style tools/perf/util/thread.c
Checking tools/perf/util/thread.c...
[tools/perf/util/thread.c:17]: (style) The scope of the variable 'leader' can be reduced.
[tools/perf/util/thread.c:133]: (style) The scope of the variable 'err' can be reduced.
[tools/perf/util/thread.c:273]: (style) The scope of the variable 'err' can be reduced.
Will continue later, but these are already useful, keep them.
1: https://sourceforge.net/p/cppcheck/wiki/Home/
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: Colin Ian King <colin.king@canonical.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-ixws7lbycihhpmq9cc949ti6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-10-03 11:24:13 -03:00
Mark Rutland
9f21b815be
perf evlist: Only open events on CPUs an evsel permits
...
In systems with heterogeneous CPU PMUs, it's possible for each evsel to
cover a distinct set of CPUs, and hence the cpu_map associated with each
evsel may have a distinct idx<->id mapping. Any of these may be distinct
from the evlist's cpu map.
Events can be tied to the same fd so long as they use the same per-cpu
ringbuffer (i.e. so long as they are on the same CPU). To acquire the
correct FDs, we must compare the Linux logical IDs rather than the evsel
or evlist indices.
This path adds logic to perf_evlist__mmap_per_evsel to handle this,
translating IDs as required. As PMUs may cover a subset of CPUs from the
evlist, we skip the CPUs a PMU cannot handle.
Without this patch, perf record may try to mmap erroneous FDs on
heterogeneous systems, and will bail out early rather than running the
workload.
Signed-off-by: Mark Rutland <mark.rutland@arm.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com >
Cc: Mark Rutland <mark.rutland@arm.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Will Deacon <will.deacon@arm.com >
Link: http://lkml.kernel.org/r/1473330112-28528-7-git-send-email-mark.rutland@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-09-08 13:44:06 -03:00
Arnaldo Carvalho de Melo
7c48dcfd32
perf evsel: Introduce constructor for cycles event
...
That is the default used when no events is specified in tools, separate
it so that simpler tools that need no evlist can use it directly.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-67mwuthscwroz88x9pswcqyv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-28 18:33:20 -03:00
Wang Nan
f6cdff8329
perf evlist: Make {pause,resume} internal helpers
...
There's no user of these two function outside evlist.c. Remove them from
public namespace.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-13-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:50 -03:00
Wang Nan
54cc54decd
perf evlist: Setup backward mmap state machine
...
Introduce a bkw_mmap_state state machine to evlist:
.________________(forbid)_____________.
| V
NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
^ ^ | ^ |
| |__(forbid)____/ |___(forbid)___/|
| |
\_________________(3)_______________/
NOTREADY : Backward ring buffers are not ready
RUNNING : Backward ring buffers are recording
DATA_PENDING : We are required to collect data from backward ring buffers
EMPTY : We have collected data from backward ring buffers.
(0): Setup backward ring buffer
(1): Pause ring buffers for reading
(2): Read from ring buffers
(3): Resume ring buffers for recording
We can't avoid this complexity. Since we deliberately drop records from
overwritable ring buffer, there's no way for us to check remaining from
ring buffer itself (by checking head and old pointers). Therefore, we
need DATA_PENDING and EMPTY state to help us recording what we have done
to the ring buffer.
In record__mmap_read_evlist(), drive this state machine from DATA_PENDING
to EMPTY.
In perf_evlist__mmap_per_evsel(), drive this state machine from NOTREADY
to RUNNING when creating backward mmap.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-11-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:49 -03:00
Wang Nan
a0c6f451f9
perf evlist: Drop evlist->backward
...
Now there's no real user of evlist->backward. Drop it. We are going to
use evlist->backward_mmap as a container for backward ring buffer.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-10-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:49 -03:00
Wang Nan
078c33862e
perf evlist: Map backward events to backward_mmap
...
In perf_evlist__mmap_per_evsel(), select backward_mmap for backward
events. Utilize new perf_mmap APIs. Dynamically alloc backward_mmap.
Remove useless functions.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-9-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:48 -03:00
Wang Nan
b2cb615d8a
perf evlist: Introduce backward_mmap array for evlist
...
Add backward_mmap to evlist, free it together with normal mmap.
Improve perf_evlist__pick_pc(), search backward_mmap if evlist->mmap is
not available.
This patch doesn't alloc this array. It will be allocated conditionally
in the following commits.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:48 -03:00
Wang Nan
a1f7261834
perf evlist: Extract common code in mmap failure processing
...
In perf_evlist__mmap_per_cpu() and perf_evlist__mmap_per_thread(), in
case of mmap failure, successfully created maps should be cleared.
Current code uses two loops calling __perf_evlist__munmap() for each
function.
This patch extracts common code to perf_evlist__munmap_nofree() and use
previous introduced decoupled API perf_mmap__munmap(). Now
__perf_evlist__munmap() can be removed because of no user.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-7-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:47 -03:00
Wang Nan
4876075b32
perf evlist: Record mmap cookie into fdarray private field
...
Insetad of saving a index into fdarray entries private field, save the
corresponding 'struct perf_mmap' pointer, and release them directly
using perf_mmap__put().
Following commits introduce multiple mmap arrays to evlist. Without this
patch, perf_evlist__munmap_filtered() is unable to retrive correct
'struct perf_mmap' pointer.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-6-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:47 -03:00
Wang Nan
8db6d6b19e
perf evlist: Update mmap related APIs and helpers
...
Currently, the evlist mmap related helpers and APIs accept evlist and
idx, and dereference 'struct perf_mmap' by evlist->mmap[idx]. This is
unnecessary, and force each evlist contains only one mmap array.
Following commits are going to introduce multiple mmap arrays to a
evlist. This patch refators these APIs and helpers, introduces
functions accept perf_mmap pointer directly. New helpers and APIs are
decoupled with perf_evlist, and become perf_mmap functions (so they have
perf_mmap prefix).
Old functions are reimplemented with new functions. Some of them will be
removed in following commits.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 17:27:46 -03:00
Arnaldo Carvalho de Melo
32a951b4fd
perf evlist: Drop redundant evsel->overwrite indicator
...
evsel->overwrite indicator means an event should be put into
overwritable ring buffer. In current implementation, it equals to
evsel->attr.write_backward. To reduce compliexity, remove
evsel->overwrite, use evsel->attr.write_backward instead.
In addition, in __perf_evsel__open(), if kernel doesn't support
write_backward and user explicitly set it in evsel, don't fallback
like other missing feature, since it is meaningless to fall back to
a forward ring buffer in this case: we are unable to stably read
from an forward overwritable ring buffer.
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Wang Nan <wangnan0@huawei.com >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-15 13:38:06 -03:00
Jiri Olsa
7cb5c5acab
perf evlist: Make event2evsel public
...
It will be used outside of evlist.c object in folowing patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Link: http://lkml.kernel.org/r/1468148882-10362-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-12 16:13:58 -03:00
Arnaldo Carvalho de Melo
c8b5f2c96d
tools: Introduce str_error_r()
...
The tools so far have been using the strerror_r() GNU variant, that
returns a string, be it the buffer passed or something else.
But that, besides being tricky in cases where we expect that the
function using strerror_r() returns the error formatted in a provided
buffer (we have to check if it returned something else and copy that
instead), breaks the build on systems not using glibc, like Alpine
Linux, where musl libc is used.
So, introduce yet another wrapper, str_error_r(), that has the GNU
interface, but uses the portable XSI variant of strerror_r(), so that
users rest asured that the provided buffer is used and it is what is
returned.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-d4t42fnf48ytlk8rjxs822tf@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-07-12 15:19:47 -03:00
Arnaldo Carvalho de Melo
e5cadb93d0
perf evlist: Rename for_each() macros to for_each_entry()
...
To match the semantics for list.h in the kernel, that are used to
implement those macros.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Milian Wolff <milian.wolff@kdab.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Taeung Song <treeze.taeung@gmail.com >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-qbcjlgj0ffxquxscahbpddi3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-06-23 11:26:15 -03:00
Arnaldo Carvalho de Melo
0b04b3dcdf
perf evlist: Destructors should accept NULL
...
And do nothing, just like free(), to avoid having to test it in callers,
usually in error paths.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-mexbavy0ft387j5w89t365eu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-06-22 10:01:48 -03:00
Wang Nan
946ae1d41d
perf evlist: Fix alloc_mmap() failure path
...
If zalloc fail, setting evlist->mmap[i].fd is unsafe and
perf_evlist__alloc_mmap() should bail out right after that.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Acked-by: Masami Hiramatsu <mhiramat@kernel.org >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Fixes: d4c6fb36achttp://lkml.kernel.org/r/1464699975-230440-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-06-03 14:53:46 -03:00
Wang Nan
258e4bfcbd
tools: Pass arg to fdarray__filter's call back function
...
Before this patch there's no way to pass arguments to fdarray__filter's
call back function.
This improvement will be used by 'perf record' to support unmapping ring
buffer for both main evlist and overwrite evlist. Without this patch
there's no way to track overwrite evlist from 'struct fdarray'.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464183898-174512-10-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-30 12:41:46 -03:00
Wang Nan
5a5ddeb6e3
perf evlist: Choose correct reading direction according to evlist->backward
...
Now we have evlist->backward to indicate the mmap direction. Make
perf_evlist__mmap_read() choose right direction automatically.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464183898-174512-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-30 12:41:45 -03:00
Wang Nan
e10e4ef63b
perf evlist: Check 'base' pointer before checking refcnt when put a mmap
...
evlist->mmap[i]->refcnt could be 0 if an evlist has no evsel or if all
evsels don't match the evlist during mmap. For example, when all evsels
are overwritable but the evlist itself is normal. To avoid crashing,
perf should check 'base' pointer before checking refcnt, and raise bug
only when base is not NULL.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464183898-174512-2-git-send-email-wangnan0@huawei.com
[ Renamed 'mmap' variable, it is reserved in old distros such as Ubuntu 12.04, breaking the build ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-30 12:41:45 -03:00
Wang Nan
f3058a1c19
perf evlist: Don't poll and mmap overwritable events
...
There's no need to receive events from overwritable ring buffer.
Instead, perf should make them run in background until some external
event of interest takes place. This patch makes ignores normal events from
overwrite evlists.
Overwritable events must be mapped readonly and backward, so if evlist
and evsel doesn't match (evsel->overwrite is true but either evlist is
read/write or evlist is not backward, and vice versa), skip mapping it.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464056944-166978-3-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com >
[ Split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-30 12:41:45 -03:00
Wang Nan
3a62a7b820
perf record: Read from backward ring buffer
...
Introduce rb_find_range() to find start and end position from a backward
ring buffer.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1463987628-163563-5-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com >
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-23 18:22:48 -03:00
Wang Nan
65aea23387
perf evlist: Add API to pause/resume
...
perf_evlist__toggle_{pause,resume}() are introduced to pause/resume
events in an evlist. Utilize PERF_EVENT_IOC_PAUSE_OUTPUT ioctl.
Following commits use them to ensure overwrite ring buffer is paused
before reading.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1463987628-163563-2-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com >
[ Return -1, like all other ioctl() usage in evlist.c, rename 'pause'
arg to avoid breaking the build on ubuntu 12.04 and other old systems ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-23 18:22:00 -03:00
Wang Nan
d4c6fb36ac
perf evsel: Record fd into perf_mmap
...
Add a fd field into struct perf_mmap so that perf can track the mmap fd.
This feature will be used for toggling overwrite ring buffers.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Masami Hiramatsu <mhiramat@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1463762315-155689-3-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com >
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-20 14:56:58 -03:00
Wang Nan
e24c7520ea
perf tools: Support reading from backward ring buffer
...
perf_evlist__mmap_read_backward() is introduced for reading backward
ring buffer. Since direction for reading such ring buffer is different
from the direction kernel writing to it, and since user need to fetch
most recent record from it, a perf_evlist__mmap_read_catchup() is
introduced to move the reading pointer to the end of the buffer.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1462758471-89706-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-09 17:20:53 -03:00
Wang Nan
b6b85dad30
perf evlist: Rename variable in perf_mmap__read()
...
In perf_mmap__read(), give better names to pointers. Original name 'old'
and 'head' directly related to pointers in ring buffer control page. For
backward ring buffer, the meaning of 'head' point is not 'the first byte
of free space', but 'the first byte of the last record'. To reduce
confusion, rename 'old' to 'start', 'head' to 'end'. 'start' -> 'end'
is the direction the records should be read from.
Change parameter order.
Change 'overwrite' to 'check_messup'. When reading from 'head', no need
to check messup for for backward ring buffer.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461723563-67451-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-05 21:04:04 -03:00
Wang Nan
0f4ccd1181
perf evlist: Extract perf_mmap__read()
...
Extract event reader from perf_evlist__mmap_read() to perf__mmap_read().
Future commit will feed it with manually computed 'head' and 'old'
pointers.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461723563-67451-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-05-05 21:04:03 -03:00
Wang Nan
b04b702375
perf evlist: Enforce ring buffer reading
...
Don't read broken data after 'head' pointer.
Following commits will feed perf_evlist__mmap_read() with some 'head'
pointers not maintained by kernel. If 'head' pointer breaks an event, we
should avoid reading from the broken event. This can happen in backward
ring buffer.
For example:
old head
| |
V V
+---+------+----------+----+-----+--+
|..E|D....D|C........C|B..B|A....|E.|
+---+------+----------+----+-----+--+
'old' pointer points to the beginning of 'A' and trying read from it,
but 'A' has been overwritten. In this case, don't try to read from 'A',
simply return NULL.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461637738-62722-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-04-26 10:56:08 -03:00
Arnaldo Carvalho de Melo
f5e7150cd9
perf evlist: Expose perf_event_mlock_kb_in_pages() helper
...
When the user doesn't set --mmap-pages, perf_evlist__mmap() will do it
by reading the maximum possible for a non-root user from the
/proc/sys/kernel/perf_event_mlock_kb file.
Expose that function so that 'perf trace' can, for root users, to bump
mmap-pages to a higher value for root, based on the contents of this
proc file.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Milian Wolff <milian.wolff@kdab.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-xay69plylwibpb3l4isrpl1k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-04-15 17:46:31 -03:00
Arnaldo Carvalho de Melo
22c8a376b5
perf evlist: Add (reset,set)_sample_bit methods
...
For fiddling with sample_type fields in all evsels in an evlist.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Milian Wolff <milian.wolff@kdab.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-dg6yavctt0hzl2tsgfb43qsr@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-04-11 22:18:21 -03:00
Wang Nan
fdf14720fb
perf tools: Only set filter for tracepoints events
...
perf_evlist__set_filter() tries to set filter to every evsel linked in
the evlist. However, since filters can only be applied to tracepoints,
checking type of evsel before calling perf_evsel__set_filter() would be
better.
Signed-off-by: Wang Nan <wangnan0@huawei.com >
Cc: Alexei Starovoitov <ast@kernel.org >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Li Zefan <lizefan@huawei.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456479154-136027-6-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-02-26 19:50:01 -03:00
Wang Nan
7630b3e28d
perf tools: Enable passing event to BPF object
...
A new syntax is added to the parser so that the user can access
predefined perf events in BPF objects.
After this patch, BPF programs for perf are finally able to utilize
bpf_perf_event_read() introduced in commit 35578d7984wangnan0@huawei.com >
Acked-by: Jiri Olsa <jolsa@kernel.org >
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com >
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: Alexei Starovoitov <ast@kernel.org >
Cc: Brendan Gregg <brendan.d.gregg@gmail.com >
Cc: Cody P Schafer <dev@codyps.com >
Cc: He Kuang <hekuang@huawei.com >
Cc: Jeremie Galarneau <jeremie.galarneau@efficios.com >
Cc: Kirill Smelkov <kirr@nexedi.com >
Cc: Li Zefan <lizefan@huawei.com >
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Zefan Li <lizefan@huawei.com >
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456132275-98875-7-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com >
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-02-22 12:30:50 -03:00
Arnaldo Carvalho de Melo
d9aade7fd2
perf evlist: Handle -EINVAL for sample_freq > max_sample_rate in strerror_open()
...
When running the "code reading" test we get:
# perf test -v "code reading" 2>&1 | tail -5
Parsing event 'cycles:u'
perf_evlist__open failed
test child finished with -1
---- end ----
Test object code reading: FAILED!
#
And with -vv we get the errno value, -22, i.e. -EINVAL, but we can do
better and handle the case at hand, with this patch it becomes:
# perf test -v "code reading" 2>&1 | tail -7
perf_evlist__open() failed!
Error: Invalid argument.
Hint: Check /proc/sys/kernel/perf_event_max_sample_rate.
Hint: The current value is 1000 and 4000 is being requested.
test child finished with -1
---- end ----
Test object code reading: FAILED!
#
Next patch will make this 'perf test' entry to use perf_evlist__strerror()
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Steven Noonan <steven@uplinklabs.net >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-i31ai6kfefn75eapejjokfhc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-02-19 19:12:42 -03:00
Arnaldo Carvalho de Melo
a55e566376
perf evlist: Reference count the cpu and thread maps at set_maps()
...
We were dropping the reference we possibly held but not obtaining one
for the new maps, which we will drop at perf_evlist__delete(), fix it.
This was caught by Steven Noonan in some of the machines which would
produce this output when caught by glibc debug mechanisms:
$ sudo perf test 21
21: Test object code reading :***
Error in `perf': corrupted double-linked list: 0x00000000023ffcd0 ***
======= Backtrace: =========
/usr/lib/libc.so.6(+0x72055)[0x7f25be0f3055]
/usr/lib/libc.so.6(+0x779b6)[0x7f25be0f89b6]
/usr/lib/libc.so.6(+0x7a0ed)[0x7f25be0fb0ed]
/usr/lib/libc.so.6(__libc_calloc+0xba)[0x7f25be0fceda]
perf(parse_events_lex_init_extra+0x38)[0x4cfff8]
perf(parse_events+0x55)[0x4a0615]
perf(perf_evlist__config+0xcf)[0x4eeb2f]
perf[0x479f82]
perf(test__code_reading+0x1e)[0x47ad4e]
perf(cmd_test+0x5dd)[0x46452d]
perf[0x47f4e3]
perf(main+0x603)[0x42c723]
/usr/lib/libc.so.6(__libc_start_main+0xf0)[0x7f25be0a1610]
perf(_start+0x29)[0x42c859]
Further investigation using valgrind led to the reference count imbalance fixed
in this patch.
Reported-and-Tested-by: Steven Noonan <steven@uplinklabs.net >
Report-Link: http://lkml.kernel.org/r/CAKbGBLjC2Dx5vshxyGmQkcD+VwiAQLbHoXA9i7kvRB2-2opHZQ@mail.gmail.com
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@kernel.org >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Fixes: f30a79b012http://lkml.kernel.org/n/tip-j0u1bdhr47sa511sgg76kb8h@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-02-18 10:48:37 -03:00
Jiri Olsa
d2190a8091
perf evlist: Remove perf_evlist__(enable|disable)_event functions
...
Replacing them with perf_evsel__(enable|disable).
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Noel Grandin <noelgrandin@gmail.com >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Link: http://lkml.kernel.org/r/1452158050-28061-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-01-08 14:15:43 -03:00
Adrian Hunter
23df7f7984
perf evlist: Make perf_evlist__open() open evsels with their cpus and threads (like perf record does)
...
'perf record' uses perf_evsel__open() to open events and passes the
evsel->cpus and evsel->threads. Many tests and some tools instead use
perf_evlist__open() which passes instead evlist->cpus and
evlist->threads.
Make perf_evlist__open() follow the 'perf record' behaviour so that a
consistent approach is taken.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Noel Grandin <noelgrandin@gmail.com >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Link: http://lkml.kernel.org/r/1452158050-28061-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-01-08 14:15:11 -03:00
Arnaldo Carvalho de Melo
5bae025023
perf evlist: Introduce perf_evlist__new_dummy constructor
...
For case where all we need is an evlist with just an "dummy" evsel,
like in some 'perf test' entries.
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Jiri Olsa <jolsa@redhat.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Wang Nan <wangnan0@huawei.com >
Link: http://lkml.kernel.org/n/tip-q52le0pblm2k3ncvyilelr9z@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2016-01-07 13:14:56 -03:00
Jiri Olsa
1c59612de0
perf evlist: Export id_add_fd()
...
Will be used to storing the event IDs in evlist object so it get stored
into perf.data file.
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Tested-by: Kan Liang <kan.liang@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Link: http://lkml.kernel.org/r/1446734469-11352-6-git-send-email-jolsa@kernel.org
[ Split from the patch storing the ids in the perf.data file ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2015-12-17 15:15:19 -03:00
Josh Poimboeuf
4b6ab94eab
perf subcmd: Create subcmd library
...
Move the subcommand-related files from perf to a new library named
libsubcmd.a.
Since we're moving files anyway, go ahead and rename 'exec_cmd.*' to
'exec-cmd.*' to be consistent with the naming of all the other files.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com >
Cc: Jiri Olsa <jolsa@redhat.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <peterz@infradead.org >
Link: http://lkml.kernel.org/r/c0a838d4c878ab17fee50998811612b2281355c1.1450193761.git.jpoimboe@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2015-12-17 14:27:14 -03:00
Jiri Olsa
3e27c92081
perf evlist: Factor perf_evlist__(enable|disable) functions
...
Use perf_evsel__(enable|disable) functions in perf_evlist__(enable|disable)
functions in order to centralize ioctl enable/disable calls. This way we
eliminate 2 places calling directly ioctl.
Signed-off-by: Jiri Olsa <jolsa@kernel.org >
Cc: Adrian Hunter <adrian.hunter@intel.com >
Cc: David Ahern <dsahern@gmail.com >
Cc: Namhyung Kim <namhyung@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Link: http://lkml.kernel.org/r/1449133606-14429-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com >
2015-12-07 18:12:58 -03:00
