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authorMiklos Szeredi <mszeredi@suse.cz>2009-03-23 16:07:24 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-23 09:22:31 -0700
commit53da1d9456fe7f87a920a78fdbdcf1225d197cb7 (patch)
treeeccd5357ceff25a9a07be802ac0161c8c1842e64 /arch
parentb0dcb4a91ddb79f2e213205cf8d86b467f8559c7 (diff)
fix ptrace slowness
This patch fixes bug #12208: Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12208 Subject : uml is very slow on 2.6.28 host This turned out to be not a scheduler regression, but an already existing problem in ptrace being triggered by subtle scheduler changes. The problem is this: - task A is ptracing task B - task B stops on a trace event - task A is woken up and preempts task B - task A calls ptrace on task B, which does ptrace_check_attach() - this calls wait_task_inactive(), which sees that task B is still on the runq - task A goes to sleep for a jiffy - ... Since UML does lots of the above sequences, those jiffies quickly add up to make it slow as hell. This patch solves this by not rescheduling in read_unlock() after ptrace_stop() has woken up the tracer. Thanks to Oleg Nesterov and Ingo Molnar for the feedback. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
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