linux/arch/frv/mm
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
..
cache-page.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-alloc.c [PATCH] mm: init_mm without ptlock 2005-10-29 21:40:40 -07:00
elf-fdpic.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
extable.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fault.c It wasn't just x86-64 that had hardcoded VM_FAULT_xxx numbers 2005-08-04 08:33:38 -07:00
highmem.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
init.c [PATCH] mm: remove PG_highmem 2005-06-21 18:46:17 -07:00
kmap.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mmu-context.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pgalloc.c [PATCH] mm: split page table lock 2005-10-29 21:40:42 -07:00
tlb-flush.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tlb-miss.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unaligned.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00