From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 29 May 2012 19:27:44 +0000 (+0200)
Subject: uprobes: Optimize is_swbp_at_addr() for current->mm
X-Git-Tag: v3.6-rc1~167^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c00b275043adc14d668f36266b890f0c53d46640;p=pandora-kernel.git

uprobes: Optimize is_swbp_at_addr() for current->mm

Change is_swbp_at_addr() to try to avoid the costly
read_opcode() if mm == current->mm, __copy_from_user_inatomic()
should succeed in the likely case.

Currently this optimization is not important, but we are going
to add more is_swbp_at_addr(current->mm) callers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120529192744.GA8057@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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