From: Omar Sandoval <osandov@xxxxxx> Hi, The performance of /proc/kcore reads has been showing up as a bottleneck for drgn. 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 patch series fixes 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. Since I have a stake in /proc/kcore and have modified it several times, the final patch volunteers me to maintain it. Thanks, Omar Omar Sandoval (4): proc/kcore: mark proc entry as permanent proc/kcore: don't walk list on every read proc/kcore: use percpu_rw_semaphore for kclist_lock MAINTAINERS: add me as /proc/kcore maintainer MAINTAINERS | 7 +++++ fs/proc/kcore.c | 81 +++++++++++++++++++++++++------------------------ 2 files changed, 48 insertions(+), 40 deletions(-) -- 2.47.0
