From: Soheil Hassas Yeganeh <[email protected]> This patch series is a follow up based on the suggestions and feedback by Linus: https://lkml.kernel.org/r/CAHk-=wizk=oxuyqpbo8ms41w2pag1kniuv5wdd5qwl-gq1k...@mail.gmail.com
The first patch in the series is a fix for the epoll race in presence of timeouts, so that it can be cleanly backported to all affected stable kernels. The rest of the patch series simplify the ep_poll() implementation. Some of these simplifications result in minor performance enhancements as well. We have kept these changes under self tests and internal benchmarks for a few days, and there are minor (1-2%) performance enhancements as a result. Signed-off-by: Soheil Hassas Yeganeh <[email protected]> Soheil Hassas Yeganeh (8): epoll: check for events when removing a timed out thread from the wait queue epoll: simplify signal handling epoll: pull fatal signal checks into ep_send_events() epoll: move eavail next to the list_empty_careful check epoll: simplify and optimize busy loop logic epoll: pull all code between fetch_events and send_event into the loop epoll: replace gotos with a proper loop epoll: eliminate unnecessary lock for zero timeout fs/eventpoll.c | 159 +++++++++++++++++++++++++------------------------ 1 file changed, 80 insertions(+), 79 deletions(-) -- 2.29.1.341.ge80a0c044ae-goog
