xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ftrace: Reduce size of function graph entries

Browse Source 
Currently ftrace_graph_ent{,_entry} and ftrace_graph_ret{,_entry} struct
can have padding bytes at the end due to alignment in 64-bit data type.
As these data are recorded so frequently, those paddings waste
non-negligible space.  As the ring buffer maintains alignment properly
for each architecture, just to remove the extra padding using 'packed'
attribute.

  ftrace_graph_ent_entry:  24 -> 20
  ftrace_graph_ret_entry:  48 -> 44

Also I moved the 'overrun' field in struct ftrace_graph_ret to minimize
the padding in the middle.

Tested on x86_64 only.

Link: http://lkml.kernel.org/r/1467197808-13578-1-git-send-email-namhyung@kernel.org

Cc: Ingo Molnar <mingo@kernel.org>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Namhyung Kim
2016-06-29 19:56:48 +09:00
committed by Steven Rostedt
parent 7ad8fb61c4
commit a4a551b8f1
3 changed files with 21 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/trace/trace_entries.h
View File

@@ -72,7 +72,7 @@ FTRACE_ENTRY_REG(function, ftrace_entry,
);
/* Function call entry */
FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
FTRACE_ENTRY_PACKED(funcgraph_entry, ftrace_graph_ent_entry,
TRACE_GRAPH_ENT,
@@ -88,7 +88,7 @@ FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
);
/* Function return entry */
FTRACE_ENTRY(funcgraph_exit, ftrace_graph_ret_entry,
FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
TRACE_GRAPH_RET,