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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, corbet@lwn.net,
	kirill.shutemov@linux.intel.com, mm-commits@vger.kernel.org,
	torvalds@linux-foundation.org, yang.shi@linux.alibaba.com,
	ziy@nvidia.com
Subject: [patch 24/32] doc: THP CoW fault no longer allocate THP
Date: Thu, 25 Jun 2020 20:30:28 -0700	[thread overview]
Message-ID: <20200626033028.Z6nJq9s5E%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200625202807.b630829d6fa55388148bee7d@linux-foundation.org>

From: Yang Shi <yang.shi@linux.alibaba.com>
Subject: doc: THP CoW fault no longer allocate THP

Since commit 3917c80280c93a7123f ("thp: change CoW semantics for
anon-THP"), THP CoW page fault is rewritten.  Now it just splits pmd then
fallback to base page fault, it doesn't try to allocate THP anymore.  So
it is no longer counted in THP_FAULT_ALLOC.

Remove the obsolete statement in documentation about THP CoW allocation to
avoid confusion.

Link: http://lkml.kernel.org/r/1592424895-5421-1-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/cgroup-v2.rst    |    4 ++--
 Documentation/admin-guide/mm/transhuge.rst |    3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

--- a/Documentation/admin-guide/cgroup-v2.rst~doc-thp-cow-fault-no-longer-allocate-thp
+++ a/Documentation/admin-guide/cgroup-v2.rst
@@ -1356,8 +1356,8 @@ PAGE_SIZE multiple when read back.
 
 	  thp_fault_alloc
 		Number of transparent hugepages which were allocated to satisfy
-		a page fault, including COW faults. This counter is not present
-		when CONFIG_TRANSPARENT_HUGEPAGE is not set.
+		a page fault. This counter is not present when CONFIG_TRANSPARENT_HUGEPAGE
+                is not set.
 
 	  thp_collapse_alloc
 		Number of transparent hugepages which were allocated to allow
--- a/Documentation/admin-guide/mm/transhuge.rst~doc-thp-cow-fault-no-longer-allocate-thp
+++ a/Documentation/admin-guide/mm/transhuge.rst
@@ -305,8 +305,7 @@ monitor how successfully the system is p
 
 thp_fault_alloc
 	is incremented every time a huge page is successfully
-	allocated to handle a page fault. This applies to both the
-	first time a page is faulted and for COW faults.
+	allocated to handle a page fault.
 
 thp_collapse_alloc
 	is incremented by khugepaged when it has found
_

  parent reply	other threads:[~2020-06-26  3:30 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26  3:28 incoming Andrew Morton
2020-06-26  3:29 ` [patch 01/32] openrisc: fix boot oops when DEBUG_VM is enabled Andrew Morton
2020-06-26  3:29 ` [patch 02/32] mm: do_swap_page(): fix up the error code Andrew Morton
2020-06-26  3:29 ` [patch 03/32] mm, compaction: make capture control handling safe wrt interrupts Andrew Morton
2020-06-26  3:29 ` [patch 04/32] kexec: do not verify the signature without the lockdown or mandatory signature Andrew Morton
2020-06-26  3:29 ` [patch 05/32] ocfs2: avoid inode removal while nfsd is accessing it Andrew Morton
2020-06-26  3:29 ` [patch 06/32] ocfs2: load global_inode_alloc Andrew Morton
2020-06-26  3:29 ` [patch 07/32] ocfs2: fix panic on nfs server over ocfs2 Andrew Morton
2020-06-26  3:29 ` [patch 08/32] ocfs2: fix value of OCFS2_INVALID_SLOT Andrew Morton
2020-06-26  3:29 ` [patch 09/32] lib: fix test_hmm.c reference after free Andrew Morton
2020-06-26  3:29 ` [patch 10/32] linux/bits.h: fix unsigned less than zero warnings Andrew Morton
2020-06-26  3:29 ` [patch 11/32] mm, slab: fix sign conversion problem in memcg_uncharge_slab() Andrew Morton
2020-06-26  3:29 ` [patch 12/32] mm/slab: use memzero_explicit() in kzfree() Andrew Morton
2020-06-26  3:29 ` [patch 13/32] slub: cure list_slab_objects() from double fix Andrew Morton
2020-06-26  3:29 ` [patch 14/32] mm: fix swap cache node allocation mask Andrew Morton
2020-06-26  3:30 ` [patch 15/32] mm/memory.c: properly pte_offset_map_lock/unlock in vm_insert_pages() Andrew Morton
2020-06-26  3:30 ` [patch 16/32] mm/debug_vm_pgtable: fix build failure with powerpc 8xx Andrew Morton
2020-06-26  3:30 ` [patch 17/32] make asm-generic/cacheflush.h more standalone Andrew Morton
2020-06-26  3:30 ` [patch 18/32] media: omap3isp: remove cacheflush.h Andrew Morton
2020-06-26  3:30 ` [patch 19/32] mm/vmalloc.c: fix a warning while make xmldocs Andrew Morton
2020-06-26  3:30 ` [patch 20/32] mm: memcontrol: handle div0 crash race condition in memory.low Andrew Morton
2020-06-26  3:30 ` [patch 21/32] mm/memcontrol.c: add missed css_put() Andrew Morton
2020-06-26  3:30 ` [patch 22/32] mm/memcontrol.c: prevent missed memory.low load tears Andrew Morton
2020-06-26  3:30 ` [patch 23/32] docs: mm/gup: minor documentation update Andrew Morton
2020-06-26  3:30 ` Andrew Morton [this message]
2020-06-26  3:30 ` [patch 25/32] mm: workingset: age nonresident information alongside anonymous pages Andrew Morton
2020-06-26  3:30 ` [patch 26/32] mm/swap: fix for "mm: workingset: age nonresident information alongside anonymous pages" Andrew Morton
2020-06-26  3:30 ` [patch 27/32] mm/memory: fix IO cost for anonymous page Andrew Morton
2020-06-26  3:30 ` [patch 28/32] x86/hyperv: allocate the hypercall page with only read and execute bits Andrew Morton
2020-06-26  3:30 ` [patch 29/32] arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page Andrew Morton
2020-06-26  3:30 ` [patch 30/32] mm: remove vmalloc_exec Andrew Morton
2020-06-26  3:30 ` [patch 31/32] mm/memory_hotplug.c: fix false softlockup during pfn range removal Andrew Morton
2020-06-26  3:30 ` [patch 32/32] MAINTAINERS: update info for sparse Andrew Morton
2020-06-27  3:32 ` + linux-next-git-rejects.patch added to -mm tree Andrew Morton
2020-06-27  3:32 ` [merged] dma-remap-align-the-size-in-dma_common__remap.patch removed from " Andrew Morton
2020-06-27  3:32 ` [merged] openrisc-fix-boot-oops-when-debug_vm-is-enabled.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-do_swap_page-fix-up-the-error-code-instantiation.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-compaction-make-capture-control-handling-safe-wrt-interrupts.patch " Andrew Morton
2020-06-27  3:33 ` [merged] kexec-do-not-verify-the-signature-without-the-lockdown-or-mandatory-signature.patch " Andrew Morton
2020-06-27  3:33 ` [merged] ocfs2-avoid-inode-removed-while-nfsd-access-it.patch " Andrew Morton
2020-06-27  3:33 ` [merged] ocfs2-load-global_inode_alloc.patch " Andrew Morton
2020-06-27  3:33 ` [merged] ocfs2-fix-panic-on-nfs-server-over-ocfs2.patch " Andrew Morton
2020-06-27  3:33 ` [merged] ocfs2-fix-value-of-ocfs2_invalid_slot.patch " Andrew Morton
2020-06-27  3:33 ` [merged] lib-fix-test_hmmc-reference-after-free.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-slab-fix-sign-conversion-problem-in-memcg_uncharge_slab.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-slab-use-memzero_explicit-in-kzfree.patch " Andrew Morton
2020-06-27  3:33 ` [merged] slub-cure-list_slab_objects-from-double-fix.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-fix-swap-cache-node-allocation-mask.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-memoryc-properly-pte_offset_map_lock-unlock-in-vm_insert_pages.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-debug_vm_pgtable-fix-build-failure-with-powerpc-8xx.patch " Andrew Morton
2020-06-27  3:33 ` [merged] make-asm-generic-cacheflushh-more-standalone.patch " Andrew Morton
2020-06-27  3:33 ` [merged] media-omap3isp-remove-cacheflushh.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-fix-a-warning-while-make-xmldocs.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-memcontrol-handle-div0-crash-race-condition-in-memorylow.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-memcontrol-fix-do-not-put-the-css-reference.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-memcg-prevent-missed-memorylow-load-tears.patch " Andrew Morton
2020-06-27  3:33 ` [merged] docs-mm-gup-minor-documentation-update.patch " Andrew Morton
2020-06-27  3:33 ` [merged] doc-thp-cow-fault-no-longer-allocate-thp.patch " Andrew Morton
2020-06-27  3:33 ` [merged] mm-workingset-age-nonresident-information-alongside-anonymous-pages.patch " Andrew Morton
2020-06-27  3:34 ` [merged] mm-swap-fix-for-mm-workingset-age-nonresident-information-alongside-anonymous-pages.patch " Andrew Morton
2020-06-27  3:34 ` [merged] mm-memory-fix-io-cost-for-anonymous-page.patch " Andrew Morton
2020-06-27  3:34 ` [merged] x86-hyperv-allocate-the-hypercall-page-with-only-read-and-execute-bits.patch " Andrew Morton
2020-06-27  3:34 ` [merged] arm64-use-page_kernel_rox-directly-in-alloc_insn_page.patch " Andrew Morton
2020-06-27  3:34 ` [merged] mm-remove-vmalloc_exec.patch " Andrew Morton
2020-06-27  3:34 ` [merged] mm-fix-false-softlockup-during-pfn-range-removal.patch " Andrew Morton
2020-06-27  3:34 ` [merged] maintainers-update-info-for-sparse.patch " Andrew Morton

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