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authorOleg Nesterov <oleg@tv-sign.ru>2007-10-16 23:30:56 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:43:03 -0700
commitf7b4cddcc5aca03e80e357360c9424dfba5056c2 (patch)
treeaf2eae61dcd0311a4c51dc7398e9d0f049f37367 /init
parentcf7a44168d743ca97863b7f34ed42a45fd7b5ab0 (diff)
do CPU_DEAD migrating under read_lock(tasklist) instead of write_lock_irq(tasklist)
Currently move_task_off_dead_cpu() is called under write_lock_irq(tasklist). This means it can't use task_lock() which is needed to improve migrating to take task's ->cpuset into account. Change the code to call move_task_off_dead_cpu() with irqs enabled, and change migrate_live_tasks() to use read_lock(tasklist). This all is a preparation for the futher changes proposed by Cliff Wickman, see http://marc.info/?t=117327786100003 Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Cliff Wickman <cpw@sgi.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com> Cc: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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