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Hugh Dickins 6f5e6b9e69 [PATCH] fix free swap cache latency ... Lee Revell reported 28ms latency when process with lots of swapped memory exits. 2.6.15 introduced a latency regression when unmapping: in accounting the zap_work latency breaker, pte_none counted 1, pte_present PAGE_SIZE, but a swap entry counted nothing at all. We think of pages present as the slow case, but Lee's trace shows that free_swap_and_cache's radix tree lookup can make a lot of work - and we could have been doing it many thousands of times without a latency break. Move the zap_work update up to account swap entries like pages present. This does account non-linear pte_file entries, and unmap_mapping_range skipping over swap entries, by the same amount even though they're quick: but neither of those cases deserves complicating the code (and they're treated no worse than they were in 2.6.14). Signed-off-by: Hugh Dickins <hugh@veritas.com> Acked-by: Nick Piggin <npiggin@suse.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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Kconfig	…
Makefile	…
bootmem.c	…
fadvise.c	…
filemap.c	…
filemap.h	…
filemap_xip.c	…
fremap.c	…
highmem.c	…
hugetlb.c	…
internal.h	…
madvise.c	…
memory.c	[PATCH] fix free swap cache latency	19 years ago
memory_hotplug.c	[PATCH] memory hotadd: pgdat->node_present_pages fix	19 years ago
mempolicy.c	[PATCH] page migration: Fail with error if swap not setup	19 years ago
mempool.c	…
mincore.c	…
mlock.c	…
mmap.c	…
mprotect.c	…
mremap.c	…
msync.c	…
nommu.c	[PATCH] nommu: implement vmalloc_node()	19 years ago
oom_kill.c	[PATCH] out_of_memory() locking fix	19 years ago
page-writeback.c	…
page_alloc.c	[PATCH] slab: Node rotor for freeing alien caches and remote per cpu pages.	19 years ago
page_io.c	…
pdflush.c	…
prio_tree.c	…
readahead.c	…
rmap.c	[PATCH] page_add_file_rmap(): remove BUG_ON()s	19 years ago
shmem.c	[PATCH] tmpfs: fix mount mpol nodelist parsing	19 years ago
slab.c	[PATCH] slab: Node rotor for freeing alien caches and remote per cpu pages.	19 years ago
slob.c	…
sparse.c	…
swap.c	[PATCH] fix race in pagevec_strip?	19 years ago
swap_state.c	…
swapfile.c	…
thrash.c	…
tiny-shmem.c	…
truncate.c	…
util.c	…
vmalloc.c	…
vmscan.c	[PATCH] page migration: fail if page is in a vma flagged VM_LOCKED	19 years ago