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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-01-20 09:36:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-01-20 09:36:55 -0800 |
| commit | d5829524243652409e3fa2853736649674c294f0 (patch) | |
| tree | a61dce0c6e73addd8532da9c11f9d1a2f679110a /security | |
| parent | ca56a74a31e26d81a481304ed2f631e65883372b (diff) | |
| parent | 4972226d0dc48ddedf071355ca664fbf34b509c8 (diff) | |
| download | linux-d5829524243652409e3fa2853736649674c294f0.tar.gz linux-d5829524243652409e3fa2853736649674c294f0.tar.bz2 linux-d5829524243652409e3fa2853736649674c294f0.zip | |
Merge tag 'vfs-6.14-rc1.kcore' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull /proc/kcore updates from Christian Brauner:
"The performance of /proc/kcore reads has been showing up as a
bottleneck for the drgn debugger. drgn scripts often spend ~25% of
their time in the kernel reading from /proc/kcore.
A lot of this overhead comes from silly inefficiencies. This pull
request contains fixes for the low-hanging fruit. The fixes are all
fairly small and straightforward.
The result is a 25% improvement in read latency in micro-benchmarks
(from ~235 nanoseconds to ~175) and a 15% improvement in execution
time for real-world drgn scripts:
- Make /proc/kcore entry permanent
- Avoid walking the list on every read
- Use percpu_rw_semaphore for kclist_lock
- Make Omar Sandoval the official maintainer for /proc/kcore"
* tag 'vfs-6.14-rc1.kcore' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
MAINTAINERS: add me as /proc/kcore maintainer
proc/kcore: use percpu_rw_semaphore for kclist_lock
proc/kcore: don't walk list on every read
proc/kcore: mark proc entry as permanent
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions