Dave Chinner c76febef57 xfs: only run xfs_error_test if error injection is active ... Recent tests writing lots of small files showed the flusher thread being CPU bound and taking a long time to do allocations on a debug kernel. perf showed this as the prime reason: samples pcnt function DSO _______ _____ ___________________________ _________________ 224648.00 36.8% xfs_error_test [kernel.kallsyms] 86045.00 14.1% xfs_btree_check_sblock [kernel.kallsyms] 39778.00 6.5% prandom32 [kernel.kallsyms] 37436.00 6.1% xfs_btree_increment [kernel.kallsyms] 29278.00 4.8% xfs_btree_get_rec [kernel.kallsyms] 27717.00 4.5% random32 [kernel.kallsyms] Walking btree blocks during allocation checking them requires each block (a cache hit, so no I/O) call xfs_error_test(), which then does a random32() call as the first operation. IOWs, ~50% of the CPU is being consumed just testing whether we need to inject an error, even though error injection is not active. Kill this overhead when error injection is not active by adding a global counter of active error traps and only calling into xfs_error_test when fault injection is active. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>		2010-12-01 07:40:20 -06:00
..
linux-2.6	xfs: push stale, pinned buffers on trylock failures	2010-12-01 07:40:20 -06:00
quota	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
support	xfs: drop dmapi hooks	2010-07-26 13:16:33 -05:00
Kconfig	quota: Make QUOTACTL config be selected by its users	2010-10-05 12:16:37 +02:00
Makefile	xfs: simplify log item descriptor tracking	2010-07-26 13:16:34 -05:00
xfs_acl.h	xfs: constify xattr_handler	2010-05-21 18:31:19 -04:00
xfs_ag.h	xfs: convert buffer cache hash to rbtree	2010-10-18 15:07:56 -05:00
xfs_alloc_btree.c	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_alloc_btree.h
xfs_alloc.c	xfs: eliminate some newly-reported gcc warnings	2010-10-18 15:07:39 -05:00
xfs_alloc.h	xfs: do not use emums for flags used in tracing	2010-07-26 13:16:43 -05:00
xfs_arch.h
xfs_attr_leaf.c	xfs: remove unused delta tracking code in xfs_bmapi	2010-07-26 13:16:39 -05:00
xfs_attr_leaf.h
xfs_attr_sf.h
xfs_attr.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_attr.h
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_bmap_btree.h
xfs_bmap.c	xfs: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -06:00
xfs_bmap.h	xfs: fix failed write truncation handling.	2010-12-01 07:40:19 -06:00
xfs_btree_trace.c
xfs_btree_trace.h
xfs_btree.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_btree.h	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_buf_item.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_buf_item.h	xfs: give li_cb callbacks the correct prototype	2010-07-26 13:16:35 -05:00
xfs_da_btree.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_da_btree.h
xfs_dfrag.c	xfs: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -06:00
xfs_dfrag.h
xfs_dinode.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_dir2_block.c	xfs: fix gcc 4.6 set but not read and unused statement warnings	2010-07-26 13:16:51 -05:00
xfs_dir2_block.h
xfs_dir2_data.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_data.h
xfs_dir2_leaf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_dir2_leaf.h
xfs_dir2_node.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_node.h
xfs_dir2_sf.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_sf.h
xfs_dir2.c	xfs: split xfs_itrace_entry	2010-07-26 13:16:44 -05:00
xfs_dir2.h
xfs_error.c	xfs: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_error.h	xfs: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_extfree_item.c	xfs: fix the xfs_log_iovec i_addr type	2010-07-26 13:16:36 -05:00
xfs_extfree_item.h
xfs_filestream.c	xfs: tell lockdep about parent iolock usage in filestreams	2010-11-10 12:00:48 -06:00
xfs_filestream.h	xfs: clean up filestreams helpers	2010-07-26 13:16:51 -05:00
xfs_fs.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_fsops.c	xfs: do not use xfs_mod_incore_sb for per-cpu counters	2010-10-18 15:07:59 -05:00
xfs_fsops.h	xfs: dummy transactions should not dirty VFS state	2010-08-24 11:46:31 +10:00
xfs_ialloc_btree.c	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_ialloc_btree.h
xfs_ialloc.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_ialloc.h
xfs_iget.c	xfs: fix bogus m_maxagi check in xfs_iget	2010-10-18 15:08:01 -05:00
xfs_inode_item.c	xfs: avoid moving stale inodes in the AIL	2010-12-01 07:40:20 -06:00
xfs_inode_item.h	xfs: simplify inode to transaction joining	2010-07-26 13:16:36 -05:00
xfs_inode.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_inode.h	new helper: ihold()	2010-10-25 21:26:11 -04:00
xfs_inum.h
xfs_iomap.c	xfs: small cleanups for xfs_iomap / __xfs_get_blocks	2010-07-26 13:16:42 -05:00
xfs_iomap.h	xfs: do not use emums for flags used in tracing	2010-07-26 13:16:43 -05:00
xfs_itable.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_itable.h	xfs: remove block number from inode lookup code	2010-06-24 11:35:17 +10:00
xfs_log_cil.c	xfs: reduce the number of CIL lock round trips during commit	2010-10-18 15:07:42 -05:00
xfs_log_priv.h	xfs: force background CIL push under sustained load	2010-09-29 07:51:03 -05:00
xfs_log_recover.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_log_recover.h	xfs: Clean up XFS_BLI_* flag namespace	2010-05-24 10:33:39 -05:00
xfs_log.c	Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs	2010-10-22 17:32:27 -07:00
xfs_log.h	xfs: remove the unused XFS_LOG_SLEEP and XFS_LOG_NOSLEEP flags	2010-07-26 13:16:38 -05:00
xfs_mount.c	xfs: fix per-ag reference counting in inode reclaim tree walking	2010-11-10 12:00:48 -06:00
xfs_mount.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_quota.h	xfs: fix a few compiler warnings with CONFIG_XFS_QUOTA=n	2010-11-10 12:00:48 -06:00
xfs_rename.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_rtalloc.c	xfs: use unhashed buffers for size checks	2010-10-18 15:07:50 -05:00
xfs_rtalloc.h	xfs: be more explicit if RT mount fails due to config	2010-05-28 14:58:24 -05:00
xfs_rw.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_rw.h
xfs_sb.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_trans_ail.c	xfs: drop dmapi hooks	2010-07-26 13:16:33 -05:00
xfs_trans_buf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_trans_extfree.c	xfs: simplify log item descriptor tracking	2010-07-26 13:16:34 -05:00
xfs_trans_inode.c	xfs: don't use vfs writeback for pure metadata modifications	2010-10-18 15:07:45 -05:00
xfs_trans_priv.h	xfs: unlock items before allowing the CIL to commit	2010-08-24 11:42:52 +10:00
xfs_trans_space.h
xfs_trans.c	xfs: fix the xfs_trans_committed	2010-10-18 15:08:02 -05:00
xfs_trans.h	xfs: remove unused t_callback field in struct xfs_trans	2010-10-18 15:08:01 -05:00
xfs_types.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_utils.c	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_utils.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_vnodeops.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_vnodeops.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs.h