linux_dsm_epyc7002/mm
Dave Chinner d87815cb20 writeback: limit write_cache_pages integrity scanning to current EOF
sync can currently take a really long time if a concurrent writer is
extending a file. The problem is that the dirty pages on the address
space grow in the same direction as write_cache_pages scans, so if
the writer keeps ahead of writeback, the writeback will not
terminate until the writer stops adding dirty pages.

For a data integrity sync, we only need to write the pages dirty at
the time we start the writeback, so we can stop scanning once we get
to the page that was at the end of the file at the time the scan
started.

This will prevent operations like copying a large file preventing
sync from completing as it will not write back pages that were
dirtied after the sync was started. This does not impact the
existing integrity guarantees, as any dirty page (old or new)
within the EOF range at the start of the scan will still be
captured.

This patch will not prevent sync from blocking on large writes into
holes. That requires more complex intervention while this patch only
addresses the common append-case of this sync holdoff.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-06-08 18:12:44 -07:00
..
backing-dev.c
bootmem.c
bounce.c
compaction.c mm: compaction: add a tunable that decides when memory should be compacted and when it should be reclaimed 2010-05-25 08:06:59 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2010-05-30 09:16:14 -07:00
fremap.c
highmem.c highmem: remove unneeded #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT for debug_kmap_atomic() 2010-05-25 08:07:01 -07:00
hugetlb.c cpuset,mm: fix no node to alloc memory when changing cpuset's mems 2010-05-25 08:06:57 -07:00
hwpoison-inject.c
init-mm.c
internal.h
Kconfig mm: allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove 2010-05-25 08:06:59 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c mm: migration: share the anon_vma ref counts between KSM and page migration 2010-05-25 08:06:58 -07:00
maccess.c
madvise.c
Makefile mm: compaction: memory compaction core 2010-05-25 08:06:59 -07:00
memcontrol.c memcg: clean up memory thresholds 2010-05-27 09:12:44 -07:00
memory_hotplug.c mem-hotplug: fix potential race while building zonelist for new populated zone 2010-05-25 08:07:02 -07:00
memory-failure.c
memory.c mm: document follow_page() 2010-05-25 08:07:00 -07:00
mempolicy.c mempolicy: ERR_PTR dereference in mpol_shared_policy_init() 2010-05-26 08:19:23 -07:00
mempool.c
migrate.c memcg: fix mis-accounting of file mapped racy with migration 2010-05-27 09:12:44 -07:00
mincore.c mincore: do nested page table walks 2010-05-25 08:06:58 -07:00
mlock.c
mm_init.c
mmap.c
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c nommu: allow private mappings of read-only devices 2010-05-26 08:19:23 -07:00
oom_kill.c memcg: make oom killer a no-op when no killable task can be found 2010-05-27 09:12:43 -07:00
page_alloc.c numa: introduce numa_mem_id()- effective local memory node id 2010-05-27 09:12:57 -07:00
page_cgroup.c
page_io.c
page_isolation.c
page-writeback.c writeback: limit write_cache_pages integrity scanning to current EOF 2010-06-08 18:12:44 -07:00
pagewalk.c
percpu_up.c
percpu-km.c
percpu-vm.c
percpu.c
prio_tree.c
quicklist.c
readahead.c readahead.c: fix comment 2010-05-25 08:07:00 -07:00
rmap.c mm: migration: avoid race between shift_arg_pages() and rmap_walk() during migration by not migrating temporary stacks 2010-05-25 08:06:59 -07:00
shmem.c fix truncate inode time modification breakage 2010-06-04 17:16:30 -04:00
slab.c numa: slab: use numa_mem_id() for slab local memory node 2010-05-27 09:12:57 -07:00
slob.c
slub.c Merge branch 'slub/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 2010-05-30 12:46:17 -07:00
sparse-vmemmap.c
sparse.c sparsemem: on no vmemmap path put mem_map on node high too 2010-05-25 08:06:56 -07:00
swap_state.c
swap.c mm: export lru_cache_add_*() to modules 2010-05-25 15:06:06 +02:00
swapfile.c
thrash.c
truncate.c fs: introduce new truncate sequence 2010-05-27 22:15:33 -04:00
util.c
vmalloc.c
vmscan.c vmscan: fix do_try_to_free_pages() return value when priority==0 reclaim failure 2010-06-04 15:21:45 -07:00
vmstat.c mm: compaction: direct compact when a high-order allocation fails 2010-05-25 08:06:59 -07:00