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authorShaohua Li <shli@kernel.org>2013-08-29 11:40:32 +0400
committerNeilBrown <neilb@suse.de>2013-09-02 04:31:29 +0400
commitbfc90cb0936f5b972706625f38f72c7cb726c20a (patch)
tree131194fdf489b6dd9eb3e165e6cd1c68bb4c629e /drivers/md/raid5.h
parent4d77e3ba88d085836f1e8e475e3131844dd89d04 (diff)
downloadlinux-bfc90cb0936f5b972706625f38f72c7cb726c20a.tar.xz
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 'drivers/md/raid5.h')
-rw-r--r--drivers/md/raid5.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 435b12d58165..2113ffa82c7a 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -213,6 +213,7 @@ struct stripe_head {
enum reconstruct_states reconstruct_state;
spinlock_t stripe_lock;
int cpu;
+ struct r5worker_group *group;
/**
* struct stripe_operations
* @target - STRIPE_OP_COMPUTE_BLK target
@@ -369,12 +370,14 @@ struct disk_info {
struct r5worker {
struct work_struct work;
struct r5worker_group *group;
+ bool working;
};
struct r5worker_group {
struct list_head handle_list;
struct r5conf *conf;
struct r5worker *workers;
+ int stripes_cnt;
};
struct r5conf {