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Rik Van Riel fcdae29aa7 [PATCH] swaptoken tuning 
It turns out that the original swap token implementation, by Song Jiang, only
enforced the swap token while the task holding the token is handling a page
fault.  This patch approximates that, without adding an additional flag to the
mm_struct, by checking whether the mm->mmap_sem is held for reading, like the
page fault code does.

This patch has the effect of automatically, and gradually, disabling the
enforcement of the swap token when there is little or no paging going on, and
"turning up" the intensity of the swap token code the more the task holding
the token is thrashing.

Thanks to Song Jiang for pointing out this aspect of the token based thrashing
control concept.

The new code shows a slight degradation over the old swap token code, but
still a big win over running without the swap token.

2.6.12+ swap token disabled

$ for i in `seq 10` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
101.74user 23.13system 8:26.91elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (38597major+430315minor)pagefaults 0swaps
101.98user 24.91system 8:03.06elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (33939major+430457minor)pagefaults 0swaps
101.93user 22.12system 7:34.90elapsed 27%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (33166major+421267minor)pagefaults 0swaps
101.82user 22.38system 8:31.40elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (39338major+433262minor)pagefaults 0swaps

2.6.12+ swap token enabled, timeout 300 seconds

$ for i in `seq 4` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
102.58user 16.08system 3:41.44elapsed 53%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (19707major+285786minor)pagefaults 0swaps
102.07user 19.56system 4:00.64elapsed 50%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (19012major+299259minor)pagefaults 0swaps
102.64user 18.25system 4:07.31elapsed 48%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (21990major+304831minor)pagefaults 0swaps
101.39user 19.41system 5:15.81elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (24850major+323321minor)pagefaults 0swaps

2.6.12+ with new swap token code, timeout 300 seconds

$ for i in `seq 4` ; do /usr/bin/time ./qsbench -n 30000000 -p 3 ; done
101.87user 24.66system 5:53.20elapsed 35%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (26848major+363497minor)pagefaults 0swaps
102.83user 19.95system 4:17.25elapsed 47%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (19946major+305722minor)pagefaults 0swaps
102.09user 19.46system 5:12.57elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (25461major+334994minor)pagefaults 0swaps
101.67user 20.61system 4:52.97elapsed 41%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (22190major+329508minor)pagefaults 0swaps

Signed-off-by: Rik Van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:35 -07:00
..
bootmem.c [PATCH] swiotlb: make sure initial DMA allocations really are in DMA memory 2005-10-19 23:11:33 -07:00
fadvise.c
filemap_xip.c [PATCH] execute-in-place fixes 2005-07-15 09:54:50 -07:00
filemap.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00
filemap.h
fremap.c [PATCH] Don't map the same page too much 2005-10-11 12:03:47 -07:00
highmem.c [PATCH] gfp_t: the rest 2005-10-28 08:16:51 -07:00
hugetlb.c [PATCH] Fix handling spurious page fault for hugetlb region 2005-10-20 09:02:07 -07:00
internal.h
Kconfig [PATCH] fix mm/Kconfig spelling 2005-09-17 11:50:01 -07:00
madvise.c [PATCH] madvise: Avoid returning error code -EBADF for anonymous mappings 2005-10-11 09:46:54 -07:00
Makefile [PATCH] xip: fs/mm: execute in place 2005-06-24 00:06:41 -07:00
memory.c [PATCH] Fix handling spurious page fault for hugetlb region 2005-10-20 09:02:07 -07:00
mempolicy.c [PATCH] gfp_t: infrastructure 2005-10-28 08:16:46 -07:00
mempool.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00
mincore.c
mlock.c
mmap.c [PATCH] fix locking comment in unmap_region() 2005-09-21 10:11:55 -07:00
mprotect.c [PATCH] mm: add a note about partially hardcoded VM_* flags 2005-09-21 10:11:55 -07:00
mremap.c [PATCH] mm: move_pte to remap ZERO_PAGE 2005-09-28 07:46:40 -07:00
msync.c [PATCH] msync: check pte dirty earlier 2005-06-21 18:46:21 -07:00
nommu.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
oom_kill.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
page_alloc.c [PATCH] gfp_t: the rest 2005-10-28 08:16:51 -07:00
page_io.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
page-writeback.c [PATCH] timer initialization cleanup: DEFINE_TIMER 2005-09-09 14:03:48 -07:00
pdflush.c
prio_tree.c
readahead.c [PATCH] readahead: reset cache_hit earlier 2005-09-07 16:57:25 -07:00
rmap.c [PATCH] swaptoken tuning 2005-10-29 21:40:35 -07:00
shmem.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00
slab.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00
sparse.c [PATCH] sparsemem extreme: hotplug preparation 2005-09-05 00:05:38 -07:00
swap_state.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
swap.c
swapfile.c [PATCH] Fix bd_claim() error code. 2005-09-22 22:17:37 -07:00
thrash.c [PATCH] swaptoken tuning 2005-10-29 21:40:35 -07:00
tiny-shmem.c
truncate.c [PATCH] DocBook: fix some descriptions 2005-05-01 08:59:26 -07:00
vmalloc.c [PATCH] vmalloc_node 2005-10-29 21:40:35 -07:00
vmscan.c [PATCH] gfp_t: mm/* (easy parts) 2005-10-28 08:16:47 -07:00