From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sat, 23 Oct 2010 15:18:01 +0000 (-0400)
Subject: fs: introduce a per-cpu last_ino allocator
X-Git-Tag: v2.6.37-rc1~94^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f991bd2e14210fb93d722cb23e54991de20e8a3d;p=pandora-kernel.git

fs: introduce a per-cpu last_ino allocator

new_inode() dirties a contended cache line to get increasing
inode numbers. This limits performance on workloads that cause
significant parallel inode allocation.

Solve this problem by using a per_cpu variable fed by the shared
last_ino in batches of 1024 allocations.  This reduces contention on
the shared last_ino, and give same spreading ino numbers than before
(i.e. same wraparound after 2^32 allocations).

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

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