Hugh Dickins 4c21e2f244 [PATCH] mm: split page table lock ... Christoph Lameter demonstrated very poor scalability on the SGI 512-way, with a many-threaded application which concurrently initializes different parts of a large anonymous area. This patch corrects that, by using a separate spinlock per page table page, to guard the page table entries in that page, instead of using the mm's single page_table_lock. (But even then, page_table_lock is still used to guard page table allocation, and anon_vma allocation.) In this implementation, the spinlock is tucked inside the struct page of the page table page: with a BUILD_BUG_ON in case it overflows - which it would in the case of 32-bit PA-RISC with spinlock debugging enabled. Splitting the lock is not quite for free: another cacheline access. Ideally, I suppose we would use split ptlock only for multi-threaded processes on multi-cpu machines; but deciding that dynamically would have its own costs. So for now enable it by config, at some number of cpus - since the Kconfig language doesn't support inequalities, let preprocessor compare that with NR_CPUS. But I don't think it's worth being user-configurable: for good testing of both split and unsplit configs, split now at 4 cpus, and perhaps change that to 8 later. There is a benefit even for singly threaded processes: kswapd can be attacking one part of the mm while another part is busy faulting. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2005-10-29 21:40:42 -07:00
..
linux-2.6	[PATCH] mm: split page table lock	2005-10-29 21:40:42 -07:00
quota	[XFS] Fix modular XFS builds (Makefile botch).	2005-09-08 15:38:52 +10:00
support	[PATCH] more SPIN_LOCK_UNLOCKED -> DEFINE_SPINLOCK conversions	2005-09-09 14:03:48 -07:00
Kconfig	[XFS] Remove special Kconfig XFS menu, make XFS options "inline".	2005-09-08 15:34:58 +10:00
Makefile	[XFS] Sort out some cosmetic differences between XFS trees.	2005-09-05 11:47:01 +10:00
Makefile-linux-2.6	[XFS] Revert recent quota Makefile change, not in a fit state for merging.	2005-09-09 11:38:09 +10:00
xfs_acl.c	[XFS] remove struct vnode::v_type	2005-09-02 16:46:51 +10:00
xfs_acl.h
xfs_ag.h
xfs_alloc_btree.c
xfs_alloc_btree.h
xfs_alloc.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_alloc.h
xfs_arch.h	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_attr_leaf.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_attr_leaf.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_attr_sf.h
xfs_attr.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_attr.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_behavior.c
xfs_behavior.h
xfs_bit.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_bit.h
xfs_bmap_btree.c	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_bmap_btree.h	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_bmap.c	[XFS] Prevent the incore superblock sb_fdblocks count from leaking when we	2005-09-02 16:40:47 +10:00
xfs_bmap.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_btree.c	[XFS] Fix up some warning fallout from functions made static	2005-06-21 15:39:44 +10:00
xfs_btree.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_buf_item.c	[XFS] 929956 add log debugging and tracing info	2005-09-02 16:42:05 +10:00
xfs_buf_item.h	[XFS] Add support for project quota, based on Dan Knappes earlier work.	2005-06-21 15:38:48 +10:00
xfs_cap.h
xfs_clnt.h
xfs_da_btree.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_da_btree.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_dfrag.c	[XFS] (mostly) remove xfs_inval_cached_pages Since the last round of	2005-06-21 15:47:39 +10:00
xfs_dfrag.h
xfs_dinode.h
xfs_dir2_block.c
xfs_dir2_block.h
xfs_dir2_data.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_dir2_data.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_dir2_leaf.c	[XFS] Fix up some warning fallout from functions made static	2005-06-21 15:39:44 +10:00
xfs_dir2_leaf.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_dir2_node.c
xfs_dir2_node.h
xfs_dir2_sf.c
xfs_dir2_sf.h
xfs_dir2_trace.c
xfs_dir2_trace.h
xfs_dir2.c
xfs_dir2.h
xfs_dir_leaf.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_dir_leaf.h	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_dir_sf.h
xfs_dir.c
xfs_dir.h
xfs_dmapi.h	[XFS] Update copyrights	2005-09-02 15:30:57 +10:00
xfs_dmops.c
xfs_error.c	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_error.h	[XFS] mark various symbols static Patch from Adrian Bunk	2005-06-21 15:36:52 +10:00
xfs_extfree_item.c	[XFS] 929956 add log debugging and tracing info	2005-09-02 16:42:05 +10:00
xfs_extfree_item.h	[XFS] consolidate extent item freeing	2005-06-21 15:41:19 +10:00
xfs_fs.h	[XFS] Makes more sense to use the fsxattr interface instead of adding new	2005-06-21 15:48:04 +10:00
xfs_fsops.c	[XFS] Remove dead code. Patch from Adrian Bunk	2005-06-21 15:36:00 +10:00
xfs_fsops.h
xfs_ialloc_btree.c
xfs_ialloc_btree.h	[XFS] add XFS_INOBT_IS_FREE_DISK	2005-06-21 15:40:20 +10:00
xfs_ialloc.c
xfs_ialloc.h
xfs_iget.c	[XFS] Retry linux inode cacech lookup if we found a stale inode. This	2005-09-05 08:33:00 +10:00
xfs_imap.h
xfs_inode_item.c	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_inode_item.h
xfs_inode.c	[XFS] remove struct vnode::v_type	2005-09-02 16:46:51 +10:00
xfs_inode.h	[XFS] rewrite xfs_iflush_all	2005-06-21 15:37:17 +10:00
xfs_inum.h
xfs_iocore.c
xfs_iomap.c	[XFS] Fix incorrect use of BMAPI_READ in unwritten extent handling	2005-09-05 10:06:55 +10:00
xfs_iomap.h
xfs_itable.c
xfs_itable.h
xfs_log_priv.h	[XFS] Cleanup some -Wundef flag warnings in the endian macros (thanks	2005-09-08 15:30:05 +10:00
xfs_log_recover.c	[XFS] Fix sparse warnings in kmem_* functions Patch from Victor Fusco	2005-09-02 16:56:02 +10:00
xfs_log_recover.h
xfs_log.c	[XFS] 929956 add log debugging and tracing info	2005-09-02 16:42:05 +10:00
xfs_log.h	[XFS] 929956 add log debugging and tracing info	2005-09-02 16:42:05 +10:00
xfs_mac.h
xfs_macros.c	[XFS] add XFS_INOBT_IS_FREE_DISK	2005-06-21 15:40:20 +10:00
xfs_macros.h
xfs_mount.c	[XFS] remove xfs_incore_relse	2005-06-21 15:38:03 +10:00
xfs_mount.h	[XFS] Add support for project quota, based on Dan Knappes earlier work.	2005-06-21 15:38:48 +10:00
xfs_qmops.c	[XFS] Need to be able to reset sb_qflags if not mounting with quotas	2005-09-05 08:24:10 +10:00
xfs_quota.h	[XFS] Need to be able to reset sb_qflags if not mounting with quotas	2005-09-05 08:24:10 +10:00
xfs_refcache.h
xfs_rename.c	[XFS] Remove dead code. Patch from Adrian Bunk	2005-06-21 15:36:00 +10:00
xfs_rtalloc.c
xfs_rtalloc.h
xfs_rw.c
xfs_rw.h
xfs_sb.h
xfs_trans_ail.c	[XFS] Need to unlock the AIL before calling xfs_force_shutdown() because	2005-09-02 16:52:55 +10:00
xfs_trans_buf.c	[XFS] Fixes a bug in the quota code when allocating a new dquot record	2005-09-05 08:29:01 +10:00
xfs_trans_extfree.c
xfs_trans_inode.c	[XFS] Remove dead code. Patch from Adrian Bunk	2005-06-21 15:36:00 +10:00
xfs_trans_item.c
xfs_trans_priv.h
xfs_trans_space.h
xfs_trans.c	[XFS] 929956 add log debugging and tracing info	2005-09-02 16:42:05 +10:00
xfs_trans.h	[XFS] Fixes a bug in the quota code when allocating a new dquot record	2005-09-05 08:29:01 +10:00
xfs_types.h	[XFS] Add a get/set interface for XFS project identifiers.	2005-06-21 13:21:49 +10:00
xfs_utils.c	[XFS] Add support for project quota, based on Dan Knappes earlier work.	2005-06-21 15:38:48 +10:00
xfs_utils.h
xfs_vfsops.c	[XFS] Sort out some cosmetic differences between XFS trees.	2005-09-05 11:47:01 +10:00
xfs_vnodeops.c	[XFS] add infrastructure for waiting on I/O completion at inode reclaim	2005-09-02 16:58:38 +10:00
xfs.h