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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	[PATCH] Swap Migration V5: Add CONFIG_MIGRATION for page migration support	19 years ago
Makefile	[PATCH] slob: introduce the SLOB allocator	19 years ago
bootmem.c	[PATCH] FRV: Clean up bootmem allocator's page freeing algorithm	19 years ago
fadvise.c	[PATCH] fadvise: return ESPIPE on FIFO/pipe	19 years ago
filemap.c	[PATCH] mm: migration page refcounting fix	19 years ago
filemap.h	[PATCH] xip: reduce code duplication	20 years ago
filemap_xip.c	[PATCH] replace inode_update_time with file_update_time	19 years ago
fremap.c	VM: add common helper function to create the page tables	19 years ago
highmem.c	[PATCH] gfp_t: the rest	20 years ago
hugetlb.c	[PATCH] compound page: use page[1].lru	19 years ago
internal.h	[PATCH] FRV: Clean up bootmem allocator's page freeing algorithm	19 years ago
madvise.c	[PATCH] madvise MADV_DONTFORK/MADV_DOFORK	19 years ago
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	[PATCH] gfp_t: mm/* (easy parts)	20 years ago
mincore.c	[PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR	20 years ago
mlock.c	[PATCH] move capable() to capability.h	19 years ago
mmap.c	[PATCH] move capable() to capability.h	19 years ago
mprotect.c	[PATCH] unpaged: private write VM_RESERVED	19 years ago
mremap.c	[PATCH] move capable() to capability.h	19 years ago
msync.c	[PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_sem	19 years ago
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	[PATCH] mm: dirty_exceeded speedup	19 years ago
page_alloc.c	[PATCH] slab: Node rotor for freeing alien caches and remote per cpu pages.	19 years ago
page_io.c	[PATCH] mm: split page table lock	20 years ago
pdflush.c	[PATCH] Swap Migration V5: PF_SWAPWRITE to allow writing to swap	19 years ago
prio_tree.c	Linux-2.6.12-rc2	20 years ago
readahead.c	[PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE	19 years ago
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	[PATCH] SLOB=y && SMP=y fix	19 years ago
sparse.c	[PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros	19 years ago
swap.c	[PATCH] fix race in pagevec_strip?	19 years ago
swap_state.c	[PATCH] Direct Migration V9: Avoid writeback / page_migrate() method	19 years ago
swapfile.c	[PATCH] Direct Migration V9: remove_from_swap() to remove swap ptes	19 years ago
thrash.c	[PATCH] temporarily disable swap token on memory pressure	19 years ago
tiny-shmem.c	[PATCH] do_truncate() call fix in tiny-shmem.c	19 years ago
truncate.c	[PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_sem	19 years ago
util.c	[PATCH] slob: introduce mm/util.c for shared functions	19 years ago
vmalloc.c	[PATCH] kernel-doc: fix warnings in vmalloc.c	20 years ago
vmscan.c	[PATCH] page migration: fail if page is in a vma flagged VM_LOCKED	19 years ago