I have been spent a lot of time to land MADV_FREE feature
by request of userland people(esp, Daniel and Jason, jemalloc guys.
Thanks for the pushing me! ;-)
There are some issues from reviewrs.
1) Swap dependency
In old version, MADV_FREE is fallback to MADV_DONTNEED on swapless
system because we don't have aged anonymous LRU list.
So there are requests for MADV_FREE to support on swapless system.
For addressing the issue, it includes new LRU list for lazyfree
pages. With that, we could support MADV_FREE on swapless system.
2) Hotness
Someone think MADV_FREEed pages are really cold while others are not.
By judging what it is, it affects reclaim policy.
For addressing the issue, it includes new knob "lazyfreeness" like
swappiness. Look at detail in decscription of mm: add knob to tune
lazyfreeing.
I have been tested it on v4.3-rc7 and couldn't find any problem so far.
git: git://git.kernel.org/pub/scm/linux/kernel/git/minchan/linux.git
branch: mm/madv_free-v4.3-rc7-v4rc2
In this stage, I don't think we need to write man page.
It could be done after solid policy and implementation.
* Change from v3
* some bug fix
* code refactoring
* lazyfree reclaim logic change
* reordering patch
* Change from v2
* vm_lazyfreeness tuning knob
* add new LRU list - Johannes, Shaohua
* support swapless - Johannes
* Change from v1
* Don't do unnecessary TLB flush - Shaohua
* Added Acked-by - Hugh, Michal
* Merge deactivate_page and deactivate_file_page
* Add pmd_dirty/pmd_mkclean patches for several arches
* Add lazy THP split patch
* Drop zhangyanfei@xxxxxxxxxxxxxx - Delivery Failure
Chen Gang (1):
arch: uapi: asm: mman.h: Let MADV_FREE have same value for all
architectures
Minchan Kim (15):
mm: support madvise(MADV_FREE)
mm: define MADV_FREE for some arches
mm: free swp_entry in madvise_free
mm: move lazily freed pages to inactive list
mm: mark stable page dirty in KSM
x86: add pmd_[dirty|mkclean] for THP
sparc: add pmd_[dirty|mkclean] for THP
powerpc: add pmd_[dirty|mkclean] for THP
arm: add pmd_mkclean for THP
arm64: add pmd_mkclean for THP
mm: don't split THP page when syscall is called
mm: introduce wrappers to add new LRU
mm: introduce lazyfree LRU list
mm: support MADV_FREE on swapless system
mm: add knob to tune lazyfreeing
Documentation/sysctl/vm.txt | 13 ++
arch/alpha/include/uapi/asm/mman.h | 1 +
arch/arm/include/asm/pgtable-3level.h | 1 +
arch/arm64/include/asm/pgtable.h | 1 +
arch/mips/include/uapi/asm/mman.h | 1 +
arch/parisc/include/uapi/asm/mman.h | 1 +
arch/powerpc/include/asm/pgtable-ppc64.h | 2 +
arch/sparc/include/asm/pgtable_64.h | 9 ++
arch/x86/include/asm/pgtable.h | 5 +
arch/xtensa/include/uapi/asm/mman.h | 1 +
drivers/base/node.c | 2 +
drivers/staging/android/lowmemorykiller.c | 3 +-
fs/proc/meminfo.c | 2 +
include/linux/huge_mm.h | 6 +
include/linux/memcontrol.h | 1 +
include/linux/mm_inline.h | 85 ++++++++++-
include/linux/mmzone.h | 26 +++-
include/linux/page-flags.h | 5 +
include/linux/rmap.h | 1 +
include/linux/swap.h | 19 ++-
include/linux/vm_event_item.h | 3 +-
include/trace/events/vmscan.h | 38 ++---
include/uapi/asm-generic/mman-common.h | 1 +
kernel/sysctl.c | 9 ++
mm/compaction.c | 14 +-
mm/huge_memory.c | 60 +++++++-
mm/ksm.c | 6 +
mm/madvise.c | 181 ++++++++++++++++++++++
mm/memcontrol.c | 44 +++++-
mm/memory-failure.c | 7 +-
mm/memory_hotplug.c | 3 +-
mm/mempolicy.c | 3 +-
mm/migrate.c | 28 ++--
mm/page_alloc.c | 7 +
mm/rmap.c | 14 ++
mm/swap.c | 84 +++++++++--
mm/swap_state.c | 11 +-
mm/vmscan.c | 240 ++++++++++++++++++++----------
mm/vmstat.c | 4 +
39 files changed, 767 insertions(+), 175 deletions(-)
--
1.9.1
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