Hugh Dickins 6a6ba83175 swapfile: swapon use discard (trim) ...

When adding swap, all the old data on swap can be forgotten: sys_swapon()
discard all but the header page of the swap partition (or every extent but
the header of the swap file), to give a solidstate swap device the
opportunity to optimize its wear-levelling.

If that succeeds, note SWP_DISCARDABLE for later use, and report it with a
"D" at the right end of the kernel's "Adding ...  swap" message.  Perhaps
something should be shown in /proc/swaps (swapon -s), but we have to be
more cautious before making any addition to that format.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Joern Engel <joern@logfs.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Donjun Shin <djshin90@gmail.com>
Cc: Tejun Heo <teheo@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2009-01-06 15:59:05 -08:00

..

allocpercpu.c

…

backing-dev.c

mm: change dirty limit type specifiers to unsigned long

2009-01-06 15:59:02 -08:00

bootmem.c

…

bounce.c

bounce: don't rely on a zeroed bio_vec list

2008-12-29 08:29:52 +01:00

dmapool.c

…

fadvise.c

…

failslab.c

SLUB: failslab support

2008-12-29 11:27:46 +02:00

filemap_xip.c

…

filemap.c

mm: write_cache_pages integrity fix

2009-01-06 15:58:59 -08:00

fremap.c

…

highmem.c

…

hugetlb.c

mm: report the MMU pagesize in /proc/pid/smaps

2009-01-06 15:58:58 -08:00

internal.h

…

Kconfig

…

maccess.c

…

madvise.c

…

Makefile

SLUB: failslab support

2008-12-29 11:27:46 +02:00

memcontrol.c

mm: make mem_cgroup_resize_limit() static

2009-01-06 15:59:04 -08:00

memory_hotplug.c

mm: remove GFP_HIGHUSER_PAGECACHE

2009-01-06 15:59:01 -08:00

memory.c

mm: make maddr __iomem

2009-01-06 15:59:04 -08:00

mempolicy.c

…

mempool.c

…

migrate.c

mm: add Set,ClearPageSwapCache stubs

2009-01-06 15:59:02 -08:00

mincore.c

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mlock.c

…

mm_init.c

…

mmap.c

mm: update my address

2009-01-05 17:44:42 -08:00

mmu_notifier.c

…

mmzone.c

…

mprotect.c

mm: cleanup: remove #ifdef CONFIG_MIGRATION

2009-01-06 15:59:00 -08:00

mremap.c

mm: update my address

2009-01-05 17:44:42 -08:00

msync.c

add a vfs_fsync helper

2009-01-05 11:54:28 -05:00

nommu.c

inode->i_op is never NULL

2009-01-05 11:54:28 -05:00

oom_kill.c

oom: print triggering task's cpuset and mems allowed

2009-01-06 15:58:59 -08:00

page_alloc.c

mm: make setup_per_zone_inactive_ratio() static

2009-01-06 15:59:05 -08:00

page_cgroup.c

mm: make init_section_page_cgroup() static

2009-01-06 15:59:04 -08:00

page_io.c

mm: try_to_free_swap replaces remove_exclusive_swap_page

2009-01-06 15:59:03 -08:00

page_isolation.c

…

page-writeback.c

mm: add dirty_background_bytes and dirty_bytes sysctls

2009-01-06 15:59:03 -08:00

pagewalk.c

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pdflush.c

cpumask: convert mm/

2009-01-01 10:12:29 +10:30

prio_tree.c

…

quicklist.c

…

readahead.c

…

rmap.c

mm: further cleanup page_add_new_anon_rmap

2009-01-06 15:59:02 -08:00

shmem_acl.c

…

shmem.c

mm: don't mark_page_accessed in shmem_fault

2009-01-06 15:58:58 -08:00

slab.c

cpumask: convert mm/

2009-01-01 10:12:29 +10:30

slob.c

…

slub.c

cpumask: convert mm/

2009-01-01 10:12:29 +10:30

sparse-vmemmap.c

…

sparse.c

…

swap_state.c

mm: remove gfp_mask from add_to_swap

2009-01-06 15:59:04 -08:00

swap.c

mm: try_to_free_swap replaces remove_exclusive_swap_page

2009-01-06 15:59:03 -08:00

swapfile.c

swapfile: swapon use discard (trim)

2009-01-06 15:59:05 -08:00

thrash.c

…

tiny-shmem.c

…

truncate.c

…

util.c

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vmalloc.c

mm: vmalloc make lazy unmapping configurable

2009-01-06 15:59:01 -08:00

vmscan.c

mm: make scan_zone_unevictable_pages() static

2009-01-06 15:59:04 -08:00

vmstat.c

cpumask: convert mm/

2009-01-01 10:12:29 +10:30