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authorFrederic Weisbecker <fweisbec@gmail.com>2015-09-09 15:38:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-10 13:29:01 -0700
commitbb304a5c6fc63d8506cd9741a3a5f35b73605625 (patch)
tree39d30e22c712abfaa9d4c2912fafb2a7ae6ad8c6 /fs
parent90f023030e26ce8f981b3e688cb79329d8d07cc3 (diff)
kmod: handle UMH_WAIT_PROC from system unbound workqueue
The UMH_WAIT_PROC handler runs in its own thread in order to make sure that waiting for the exec kernel thread completion won't block other usermodehelper queued jobs. On older workqueue implementations, worklets couldn't sleep without blocking the rest of the queue. But now the workqueue subsystem handles that. Khelper still had the older limitation due to its singlethread properties but we replaced it to system unbound workqueues. Those are affine to the current node and can block up to some number of instances. They are a good candidate to handle UMH_WAIT_PROC assuming that we have enough system unbound workers to handle lots of parallel usermodehelper jobs. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Rik van Riel <riel@redhat.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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