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perf intel-pt/bts: Tidy instruction buffer size usage

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Tidy instruction buffer size usage in preparation for copying the
instruction bytes onto samples.

The instruction buffer is presently used for debugging, so rename its
size macro from INTEL_PT_INSN_DBG_BUF_SZ to INTEL_PT_INSN_BUF_SZ, and
use it everywhere.

Note that the maximum instruction size is 15 which is a less efficient size
to copy than 16, which is why a separate buffer size is used.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1475847747-30994-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2016-10-07 16:42:25 +03:00
committed by Arnaldo Carvalho de Melo
parent e9c848928a
commit 32f98aab75
5 changed files with 16 additions and 23 deletions
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8
tools/perf/util/intel-bts.c
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@@ -319,15 +319,12 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
struct machine *machine = btsq->bts->machine;
struct thread *thread;
struct addr_location al;
unsigned char buf[1024];
size_t bufsz;
unsigned char buf[INTEL_PT_INSN_BUF_SZ];
ssize_t len;
int x86_64;
uint8_t cpumode;
int err = -1;
bufsz = intel_pt_insn_max_size();
if (machine__kernel_ip(machine, ip))
cpumode = PERF_RECORD_MISC_KERNEL;
else
@@ -341,7 +338,8 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
if (!al.map || !al.map->dso)
goto out_put;
len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz);
len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
INTEL_PT_INSN_BUF_SZ);
if (len <= 0)
goto out_put;