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authorEric Dumazet <edumazet@google.com>2015-08-28 19:42:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-05 13:46:58 -0700
commitc82199061009d1561e31e17fca5e47a87cb7ff4c (patch)
tree547ec8ef61b4d70c57ff478d9d1de4853c373d92 /init
parentf377ea88b862bf7151be96d276f4cb740f8e1c41 (diff)
downloadlinux-c82199061009d1561e31e17fca5e47a87cb7ff4c.tar.gz
task_work: remove fifo ordering guarantee
In commit f341861fb0b ("task_work: add a scheduling point in task_work_run()") I fixed a latency problem adding a cond_resched() call. Later, commit ac3d0da8f329 added yet another loop to reverse a list, bringing back the latency spike : I've seen in some cases this loop taking 275 ms, if for example a process with 2,000,000 files is killed. We could add yet another cond_resched() in the reverse loop, or we can simply remove the reversal, as I do not think anything would depend on order of task_work_add() submitted works. Fixes: ac3d0da8f329 ("task_work: Make task_work_add() lockless") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Maciej ┼╗enczykowski <maze@google.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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