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| author |   Miklos Szeredi <mszeredi@suse.cz> | 2008-02-06 01:38:39 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:13 -0800 |
| commit | d12def1bcb809b6172ee207a24e00a0a4398df1d (patch) | |
| tree | 96e151de1e80cacd9202a00b77654533a9754207 /fs/fuse/fuse_i.h | |
| parent | fuse: save space in struct fuse_req (diff) | |
| download | linux-dev-d12def1bcb809b6172ee207a24e00a0a4398df1d.tar.xz linux-dev-d12def1bcb809b6172ee207a24e00a0a4398df1d.zip | |
fuse: limit queued background requests
Libfuse basically creates a new thread for each new request. This is fine for
synchronous requests, which are naturally limited. However background
requests (especially writepage) can cause a thread creation storm.
To avoid this, limit the number of background requests available to userspace.
This is done by introducing another queue for background requests, and a
counter for the number of "active" requests, which are currently available for
userspace.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fuse/fuse_i.h')
| -rw-r--r-- | fs/fuse/fuse_i.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index c5c1ebff1e2d..67aaf6ee38ea 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -296,6 +296,12 @@ struct fuse_conn { /** Number of requests currently in the background */ unsigned num_background; + /** Number of background requests currently queued for userspace */ + unsigned active_background; + + /** The list of background requests set aside for later queuing */ + struct list_head bg_queue; + /** Pending interrupts */ struct list_head interrupts; |