From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 27 Apr 2011 17:50:21 +0000 (+0200)
Subject: signal: retarget_shared_pending: optimize while_each_thread() loop
X-Git-Tag: v3.0-rc1~382^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fec9993db093acfc3999a364e31f8adae41fcb28;p=pandora-kernel.git

signal: retarget_shared_pending: optimize while_each_thread() loop

retarget_shared_pending() blindly does recalc_sigpending_and_wake() for
every sub-thread, this is suboptimal. We can check t->blocked and stop
looping once every bit in shared_pending has the new target.

Note: we do not take task_is_stopped_or_traced(t) into account, we are
not trying to speed up the signal delivery or to avoid the unnecessary
(but harmless) signal_wake_up(0) in this unlikely case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
---

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