From: Davi Arnaut <davi@haxent.com.br>
Date: Wed, 23 May 2007 20:58:04 +0000 (-0700)
Subject: signalfd: retrieve multiple signals with one read() call
X-Git-Tag: v2.6.22-rc3~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3762bfc8d046342db664d855f8f875e8a4c2ca1;p=pandora-kernel.git

signalfd: retrieve multiple signals with one read() call

Gathering signals in bulk enables server applications to drain a signal
queue (almost full of realtime signals) more efficiently by reducing the
syscall and file look-up overhead.

Very similar to the sigtimedwait4() call described by Niels Provos, Chuck
Lever, and Stephen Tweedie in a paper entitled "Analyzing the Overload
Behavior of a Simple Web Server".  The paper lists more details and
advantages.

Signed-off-by: Davi E. M. Arnaut <davi@haxent.com.br>
Acked-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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