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| author | Theodore Ts'o <tytso@mit.edu> | 2019-11-28 22:26:51 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-01-17 16:24:25 -0500 |
| commit | d4c5e960bf202d99ec9a6922ad387eafb798b848 (patch) | |
| tree | ee055127be4ebb1c9eccf1cee15185327255d6d2 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 8cd115bdda17751ee2adab614a80df72228b3809 (diff) | |
ext4: avoid fetching btime in ext4_getattr() unless requested
Linus observed that an allmodconfig build which does a lot of stat(2)
calls that ext4_getattr() was a noticeable (1%) amount of CPU time,
due to the cache line for i_extra_isize getting pulled in. Since the
normal stat system call doesn't return btime, it's a complete waste.
So only calculate btime when it is explicitly requested.
[ Fixed to check against request_mask instead of query_flags. ]
Link: https://lore.kernel.org/r/CAHk-=wivmk_j6KbTX+Er64mLrG8abXZo0M10PNdAnHc8fWXfsQ@mail.gmail.com
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions