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Message-Id: <20201106231635.3528496-1-soheil.kdev@gmail.com>
Date: Fri, 6 Nov 2020 18:16:27 -0500
From: Soheil Hassas Yeganeh <soheil.kdev@...il.com>
To: torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
dave@...olabs.net, edumazet@...gle.com, willemb@...gle.com,
khazhy@...gle.com, guantaol@...gle.com,
Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: [PATCH 0/8] simplify ep_poll
From: Soheil Hassas Yeganeh <soheil@...gle.com>
This patch series is a follow up based on the suggestions and feedback by Linus:
https://lkml.kernel.org/r/CAHk-=wizk=OxUyQPbO8MS41w2Pag1kniUV5WdD5qWL-gq1kjDA@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 <soheil@...gle.com>
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
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