From e3a746f5aab71f2dd0a83116772922fb37ae29d6 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Thu, 12 Jul 2012 07:40:42 +1000 Subject: xfs: really fix the cursor leak in xfs_alloc_ag_vextent_near The current cursor is reallocated when retrying the allocation, so the existing cursor needs to be destroyed in both the restart and the failure cases. Signed-off-by: Dave Chinner Tested-by: Mike Snitzer Signed-off-by: Ben Myers --- fs/xfs/xfs_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/xfs/xfs_alloc.c') diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c index 9d1aeb7e273..f654f51b0c6 100644 --- a/fs/xfs/xfs_alloc.c +++ b/fs/xfs/xfs_alloc.c @@ -1074,13 +1074,13 @@ restart: * If we couldn't get anything, give up. */ if (bno_cur_lt == NULL && bno_cur_gt == NULL) { + xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); + if (!forced++) { trace_xfs_alloc_near_busy(args); xfs_log_force(args->mp, XFS_LOG_SYNC); goto restart; } - - xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); trace_xfs_alloc_size_neither(args); args->agbno = NULLAGBLOCK; return 0; -- cgit v1.2.3-70-g09d2 From aa292847b9fc6e187547110de833a7d3131bbddf Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Thu, 12 Jul 2012 07:40:43 +1000 Subject: 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 Reported-by: Mel Gorman Tested-by: Mel Gorman Signed-off-by: Ben Myers --- fs/xfs/xfs_alloc.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'fs/xfs/xfs_alloc.c') diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c index f654f51b0c6..4f33c32affe 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); -- cgit v1.2.3-70-g09d2