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authorDave Chinner <dchinner@redhat.com>2012-07-12 07:40:43 +1000
committerBen Myers <bpm@sgi.com>2012-07-13 13:09:27 -0500
commitaa292847b9fc6e187547110de833a7d3131bbddf (patch)
treedf2976e85569c2f04531733508606ffa969661da /fs/xfs
parente3a746f5aab71f2dd0a83116772922fb37ae29d6 (diff)
xfs: don't defer metadata allocation to the workqueue
Almost all metadata allocations come from shallow stack usage situations. Avoid the overhead of switching the allocation to a workqueue as we are not in danger of running out of stack when making these allocations. Metadata allocations are already marked through the args that are passed down, so this is trivial to do. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reported-by: Mel Gorman <mgorman@suse.de> Tested-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_alloc.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index f654f51b0c67..4f33c32affe3 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -2434,13 +2434,22 @@ xfs_alloc_vextent_worker(
current_restore_flags_nested(&pflags, PF_FSTRANS);
}
-
-int /* error */
+/*
+ * Data allocation requests often come in with little stack to work on. Push
+ * them off to a worker thread so there is lots of stack to use. Metadata
+ * requests, OTOH, are generally from low stack usage paths, so avoid the
+ * context switch overhead here.
+ */
+int
xfs_alloc_vextent(
- xfs_alloc_arg_t *args) /* allocation argument structure */
+ struct xfs_alloc_arg *args)
{
DECLARE_COMPLETION_ONSTACK(done);
+ if (!args->userdata)
+ return __xfs_alloc_vextent(args);
+
+
args->done = &done;
INIT_WORK_ONSTACK(&args->work, xfs_alloc_vextent_worker);
queue_work(xfs_alloc_wq, &args->work);