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fuse: introduce fc->bg_lock

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To reduce contention of fc->lock, this patch introduces bg_lock for
protection of fields related to background queue. These are:
max_background, congestion_threshold, num_background, active_background,
bg_queue and blocked.

This allows next patch to make async reads not requiring fc->lock, so async
reads and writes will have better performance executed in parallel.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Kirill Tkhai
2018-08-27 18:29:46 +03:00
committed by Miklos Szeredi
parent 2b30a53314
commit ae2dffa394
5 changed files with 26 additions and 15 deletions
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8
fs/fuse/control.c
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@@ -125,12 +125,12 @@ static ssize_t fuse_conn_max_background_write(struct file *file,
if (ret > 0) {
struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
if (fc) {
spin_lock(&fc->lock);
spin_lock(&fc->bg_lock);
fc->max_background = val;
fc->blocked = fc->num_background >= fc->max_background;
if (!fc->blocked)
wake_up(&fc->blocked_waitq);
spin_unlock(&fc->lock);
spin_unlock(&fc->bg_lock);
fuse_conn_put(fc);
}
}
@@ -171,7 +171,7 @@ static ssize_t fuse_conn_congestion_threshold_write(struct file *file,
if (!fc)
goto out;
spin_lock(&fc->lock);
spin_lock(&fc->bg_lock);
fc->congestion_threshold = val;
if (fc->sb) {
if (fc->num_background < fc->congestion_threshold) {
@@ -182,7 +182,7 @@ static ssize_t fuse_conn_congestion_threshold_write(struct file *file,
set_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC);
}
}
spin_unlock(&fc->lock);
spin_unlock(&fc->bg_lock);
fuse_conn_put(fc);
out:
return ret;