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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>		19 years ago
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Makefile	Linux-2.6.12-rc2	20 years ago
acl.c	JFS: allow extended attributes to be set within a existing transaction	20 years ago
endian24.h	Linux-2.6.12-rc2	20 years ago
file.c	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
inode.c	JFS: Fix sparse warnings, including endian error	20 years ago
jfs_acl.h	JFS: allow extended attributes to be set within a existing transaction	20 years ago
jfs_btree.h	Linux-2.6.12-rc2	20 years ago
jfs_debug.c	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_debug.h	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_dinode.h	Linux-2.6.12-rc2	20 years ago
jfs_dmap.c	JFS: Corrupted block map should not cause trap	19 years ago
jfs_dmap.h	Linux-2.6.12-rc2	20 years ago
jfs_dtree.c	JFS: Fix i_blocks accounting when allocation fails	20 years ago
jfs_dtree.h	JFS: Code cleanup - getting rid of never-used debug code	20 years ago
jfs_extent.c	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_extent.h	Linux-2.6.12-rc2	20 years ago
jfs_filsys.h	[PATCH] disk quotas fail when /etc/mtab is symlinked to /proc/mounts	20 years ago
jfs_imap.c	JFS: make special inodes play nicely with page balancing	20 years ago
jfs_imap.h	Linux-2.6.12-rc2	20 years ago
jfs_incore.h	[PATCH] JFS: Support page sizes greater than 4K	20 years ago
jfs_inode.c	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_inode.h	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_lock.h	Linux-2.6.12-rc2	20 years ago
jfs_logmgr.c	JFS: Improve sync barrier processing	20 years ago
jfs_logmgr.h	JFS: Improve sync barrier processing	20 years ago
jfs_metapage.c	[PATCH] mm: split page table lock	19 years ago
jfs_metapage.h	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_mount.c	[PATCH] JFS: Support page sizes greater than 4K	20 years ago
jfs_superblock.h	JFS: fix sparse warnings by moving extern declarations to headers	20 years ago
jfs_txnmgr.c	JFS: make special inodes play nicely with page balancing	20 years ago
jfs_txnmgr.h	JFS: don't dereference tlck->ip from txUpdateMap	20 years ago
jfs_types.h	Linux-2.6.12-rc2	20 years ago
jfs_umount.c	[PATCH] JFS: Support page sizes greater than 4K	20 years ago
jfs_unicode.c	JFS: performance patch	20 years ago
jfs_unicode.h	Linux-2.6.12-rc2	20 years ago
jfs_uniupr.c	Linux-2.6.12-rc2	20 years ago
jfs_xattr.h	JFS: Implement jfs_init_security	20 years ago
jfs_xtree.c	JFS: make sure right-most xtree pages have header.next set to zero	19 years ago
jfs_xtree.h	JFS: Code cleanup - getting rid of never-used debug code	20 years ago
namei.c	JFS: Implement jfs_init_security	20 years ago
resize.c	[PATCH] JFS: Support page sizes greater than 4K	20 years ago
super.c	JFS: make special inodes play nicely with page balancing	20 years ago
symlink.c	[PATCH] Fix up symlink function pointers	20 years ago
xattr.c	JFS: Implement jfs_init_security	20 years ago