lkml.org 
[lkml]   [2022]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH bpf-next v2] bpf: Cache the last valid build_id.
From
On 2/23/22 19:05, Hao Luo wrote:
> For binaries that are statically linked, consecutive stack frames are
> likely to be in the same VMA and therefore have the same build id.
> As an optimization for this case, we can cache the previous frame's
> VMA, if the new frame has the same VMA as the previous one, reuse the
> previous one's build id. We are holding the MM locks as reader across
> the entire loop, so we don't need to worry about VMA going away.
>
> Tested through "stacktrace_build_id" and "stacktrace_build_id_nmi" in
> test_progs.
>
> Suggested-by: Greg Thelen <gthelen@google.com>
> Signed-off-by: Hao Luo <haoluo@google.com>

Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>

Thanks,
Pasha

\
 
 \ /
  Last update: 2022-02-25 21:45    [W:0.108 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site