From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Sat, 28 Oct 2006 17:38:54 +0000 (-0700)
Subject: [PATCH] taskstats: don't use tasklist_lock
X-Git-Tag: v2.6.19-rc4~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a98b6094261c0112e9c455c96995972181bff049;p=pandora-kernel.git

[PATCH] taskstats: don't use tasklist_lock

Remove tasklist_lock from taskstats.c. find_task_by_pid() is rcu-safe.
->siglock allows us to traverse subthread without tasklist.

Q: delay accounting looks wrong to me.  If sub-thread has already called
taskstats_exit_send() but didn't call release_task(self) yet it will be
accounted twice.  The window is big.  No?

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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