From: Miklos Szeredi <[EMAIL PROTECTED]> Set the read and write congestion state if the request queue is close to blocking, and clear it when it's not.
This prevents unnecessary blocking in readahead and writeback. Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]> --- Index: linux/fs/fuse/dev.c =================================================================== --- linux.orig/fs/fuse/dev.c 2007-02-27 14:40:55.000000000 +0100 +++ linux/fs/fuse/dev.c 2007-02-27 14:41:09.000000000 +0100 @@ -224,6 +224,10 @@ static void request_end(struct fuse_conn fc->blocked = 0; wake_up_all(&fc->blocked_waitq); } + if (fc->num_background == FUSE_CONGESTION_THRESHOLD) { + clear_bdi_congested(&fc->bdi, READ); + clear_bdi_congested(&fc->bdi, WRITE); + } fc->num_background--; } spin_unlock(&fc->lock); @@ -378,6 +382,10 @@ static void request_send_nowait(struct f fc->num_background++; if (fc->num_background == FUSE_MAX_BACKGROUND) fc->blocked = 1; + if (fc->num_background == FUSE_CONGESTION_THRESHOLD) { + set_bdi_congested(&fc->bdi, READ); + set_bdi_congested(&fc->bdi, WRITE); + } queue_request(fc, req); spin_unlock(&fc->lock); Index: linux/fs/fuse/fuse_i.h =================================================================== --- linux.orig/fs/fuse/fuse_i.h 2007-02-27 14:40:55.000000000 +0100 +++ linux/fs/fuse/fuse_i.h 2007-02-27 14:41:09.000000000 +0100 @@ -20,7 +20,10 @@ #define FUSE_MAX_PAGES_PER_REQ 32 /** Maximum number of outstanding background requests */ -#define FUSE_MAX_BACKGROUND 10 +#define FUSE_MAX_BACKGROUND 12 + +/** Congestion starts at 75% of maximum */ +#define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100) /** It could be as large as PATH_MAX, but would that have any uses? */ #define FUSE_NAME_MAX 1024 -- - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html