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authorShaohua Li <shli@kernel.org>2013-08-29 15:40:32 +0800
committerNeilBrown <neilb@suse.de>2013-09-02 10:31:29 +1000
commitbfc90cb0936f5b972706625f38f72c7cb726c20a (patch)
tree131194fdf489b6dd9eb3e165e6cd1c68bb4c629e /lib
parent4d77e3ba88d085836f1e8e475e3131844dd89d04 (diff)
raid5: only wakeup necessary threads
If there are not enough stripes to handle, we'd better not always queue all available work_structs. If one worker can only handle small or even none stripes, it will impact request merge and create lock contention. With this patch, the number of work_struct running will depend on pending stripes number. Note: some statistics info used in the patch are accessed without locking protection. This should doesn't matter, we just try best to avoid queue unnecessary work_struct. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'lib')
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