From: Miklos Szeredi <mszeredi@suse.cz>
Date: Wed, 6 Feb 2008 09:38:39 +0000 (-0800)
Subject: fuse: limit queued background requests
X-Git-Tag: v2.6.25-rc1~624
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d12def1bcb809b6172ee207a24e00a0a4398df1d;p=pandora-kernel.git

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>
---

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