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| author | Breno Leitao <leitao@debian.org> | 2024-10-04 09:48:31 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-11-06 20:11:09 -0800 |
| commit | 04f315a7dc43a097050534679600974592494a22 (patch) | |
| tree | 4cef9e6b0a957629bc2f931cc000f94642500f50 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | maple_tree: do not hash pointers on dump in debug mode (diff) | |
| download | linux-04f315a7dc43a097050534679600974592494a22.tar.gz linux-04f315a7dc43a097050534679600974592494a22.zip | |
mm: remove misleading 'unlikely' hint in vms_gather_munmap_vmas()
Performance analysis using branch annotation on a fleet of 200 hosts
running web servers revealed that the 'unlikely' hint in
vms_gather_munmap_vmas() was 100% consistently incorrect. In all observed
cases, the branch behavior contradicted the hint.
Remove the 'unlikely' qualifier from the condition checking 'vms->uf'. By
doing so, we allow the compiler to make optimization decisions based on
its own heuristics and profiling data, rather than relying on a static
hint that has proven to be inaccurate in real-world scenarios.
Link: https://lkml.kernel.org/r/20241004164832.218681-1-leitao@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions