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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, alex.shi@linux.alibaba.com,
	ben.widawsky@intel.com, cai@lca.pw, cl@linux.com,
	dan.j.williams@intel.com, dave.hansen@linux.intel.com,
	dwagner@suse.de, linux-mm@kvack.org, mm-commits@vger.kernel.org,
	osalvador@suse.de, rientjes@google.com, tobin@kernel.org,
	torvalds@linux-foundation.org, ying.huang@intel.com
Subject: [patch 061/143] mm/vmscan: replace implicit RECLAIM_ZONE checks with explicit checks
Date: Tue, 04 May 2021 18:36:04 -0700	[thread overview]
Message-ID: <20210505013604.yKOCIK--1%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210504183219.a3cc46aee4013d77402276c5@linux-foundation.org>

From: Dave Hansen <dave.hansen@linux.intel.com>
Subject: mm/vmscan: replace implicit RECLAIM_ZONE checks with explicit checks

RECLAIM_ZONE was assumed to be unused because it was never explicitly used
in the kernel.  However, there were a number of places where it was
checked implicitly by checking 'node_reclaim_mode' for a zero value.

These zero checks are not great because it is not obvious what a zero mode
*means* in the code.  Replace them with a helper which makes it more
obvious: node_reclaim_enabled().

This helper also provides a handy place to explicitly check the
RECLAIM_ZONE bit itself.  Check it explicitly there to make it more
obvious where the bit can affect behavior.

This should have no functional impact.

Link: https://lkml.kernel.org/r/20210219172559.BF589C44@viggo.jf.intel.com
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: "Tobin C. Harding" <tobin@kernel.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/swap.h |    7 +++++++
 mm/khugepaged.c      |    2 +-
 mm/page_alloc.c      |    2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

--- a/include/linux/swap.h~mm-vmscan-replace-implicit-reclaim_zone-checks-with-explicit-checks
+++ a/include/linux/swap.h
@@ -12,6 +12,7 @@
 #include <linux/fs.h>
 #include <linux/atomic.h>
 #include <linux/page-flags.h>
+#include <uapi/linux/mempolicy.h>
 #include <asm/page.h>
 
 struct notifier_block;
@@ -378,6 +379,12 @@ extern int sysctl_min_slab_ratio;
 #define node_reclaim_mode 0
 #endif
 
+static inline bool node_reclaim_enabled(void)
+{
+	/* Is any node_reclaim_mode bit set? */
+	return node_reclaim_mode & (RECLAIM_ZONE|RECLAIM_WRITE|RECLAIM_UNMAP);
+}
+
 extern void check_move_unevictable_pages(struct pagevec *pvec);
 
 extern int kswapd_run(int nid);
--- a/mm/khugepaged.c~mm-vmscan-replace-implicit-reclaim_zone-checks-with-explicit-checks
+++ a/mm/khugepaged.c
@@ -809,7 +809,7 @@ static bool khugepaged_scan_abort(int ni
 	 * If node_reclaim_mode is disabled, then no extra effort is made to
 	 * allocate memory locally.
 	 */
-	if (!node_reclaim_mode)
+	if (!node_reclaim_enabled())
 		return false;
 
 	/* If there is a count for this node already, it must be acceptable */
--- a/mm/page_alloc.c~mm-vmscan-replace-implicit-reclaim_zone-checks-with-explicit-checks
+++ a/mm/page_alloc.c
@@ -3968,7 +3968,7 @@ retry:
 			if (alloc_flags & ALLOC_NO_WATERMARKS)
 				goto try_this_zone;
 
-			if (node_reclaim_mode == 0 ||
+			if (!node_reclaim_enabled() ||
 			    !zone_allows_reclaim(ac->preferred_zoneref->zone, zone))
 				continue;
 
_

  parent reply	other threads:[~2021-05-05  1:36 UTC|newest]

Thread overview: 146+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05  1:32 incoming Andrew Morton
2021-05-05  1:32 ` [patch 001/143] mm: introduce and use mapping_empty() Andrew Morton
2021-05-05  1:32 ` [patch 002/143] mm: stop accounting shadow entries Andrew Morton
2021-05-05  1:32 ` [patch 003/143] dax: account DAX entries as nrpages Andrew Morton
2021-05-05  1:32 ` [patch 004/143] mm: remove nrexceptional from inode Andrew Morton
2021-05-05  1:32 ` [patch 005/143] mm: remove nrexceptional from inode: remove BUG_ON Andrew Morton
2021-05-05  1:33 ` [patch 006/143] hugetlb: pass vma into huge_pte_alloc() and huge_pmd_share() Andrew Morton
2021-05-05  1:33 ` [patch 007/143] hugetlb/userfaultfd: forbid huge pmd sharing when uffd enabled Andrew Morton
2021-05-05  1:33 ` [patch 008/143] mm/hugetlb: move flush_hugetlb_tlb_range() into hugetlb.h Andrew Morton
2021-05-05  1:33 ` [patch 009/143] hugetlb/userfaultfd: unshare all pmds for hugetlbfs when register wp Andrew Morton
2021-05-05  1:33 ` [patch 010/143] mm/hugetlb: remove redundant reservation check condition in alloc_huge_page() Andrew Morton
2021-05-05  1:33 ` [patch 011/143] mm: generalize HUGETLB_PAGE_SIZE_VARIABLE Andrew Morton
2021-05-05  1:33 ` [patch 012/143] mm/hugetlb: use some helper functions to cleanup code Andrew Morton
2021-05-05  1:33 ` [patch 013/143] mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state() Andrew Morton
2021-05-05  1:33 ` [patch 014/143] mm/hugetlb_cgroup: remove unnecessary VM_BUG_ON_PAGE in hugetlb_cgroup_migrate() Andrew Morton
2021-05-05  1:33 ` [patch 015/143] mm/hugetlb: simplify the code when alloc_huge_page() failed in hugetlb_no_page() Andrew Morton
2021-05-05  1:33 ` [patch 016/143] mm/hugetlb: avoid calculating fault_mutex_hash in truncate_op case Andrew Morton
2021-05-05  1:33 ` [patch 017/143] khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped_thps() Andrew Morton
2021-05-05  1:33 ` [patch 018/143] khugepaged: reuse the smp_wmb() inside __SetPageUptodate() Andrew Morton
2021-05-05  1:33 ` [patch 019/143] khugepaged: use helper khugepaged_test_exit() in __khugepaged_enter() Andrew Morton
2021-05-05  1:33 ` [patch 020/143] khugepaged: fix wrong result value for trace_mm_collapse_huge_page_isolate() Andrew Morton
2021-05-05  1:33 ` [patch 021/143] mm/huge_memory.c: remove unnecessary local variable ret2 Andrew Morton
2021-05-05  1:33 ` [patch 022/143] mm/huge_memory.c: rework the function vma_adjust_trans_huge() Andrew Morton
2021-05-05  1:33 ` [patch 023/143] mm/huge_memory.c: make get_huge_zero_page() return bool Andrew Morton
2021-05-05  1:33 ` [patch 024/143] mm/huge_memory.c: rework the function do_huge_pmd_numa_page() slightly Andrew Morton
2021-05-05  1:34 ` [patch 025/143] mm/huge_memory.c: remove redundant PageCompound() check Andrew Morton
2021-05-05  1:34 ` [patch 026/143] mm/huge_memory.c: remove unused macro TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG Andrew Morton
2021-05-05  1:34 ` [patch 027/143] mm/huge_memory.c: use helper function migration_entry_to_page() Andrew Morton
2021-05-05  1:34 ` [patch 028/143] mm/khugepaged.c: replace barrier() with READ_ONCE() for a selective variable Andrew Morton
2021-05-05  1:34 ` [patch 029/143] khugepaged: use helper function range_in_vma() in collapse_pte_mapped_thp() Andrew Morton
2021-05-05  1:34 ` [patch 030/143] khugepaged: remove unnecessary out label in collapse_huge_page() Andrew Morton
2021-05-05  1:34 ` [patch 031/143] khugepaged: remove meaningless !pte_present() check in khugepaged_scan_pmd() Andrew Morton
2021-05-05  1:34 ` [patch 032/143] mm: huge_memory: a new debugfs interface for splitting THP tests Andrew Morton
2021-05-05  1:34 ` [patch 033/143] mm: huge_memory: debugfs for file-backed THP split Andrew Morton
2021-05-05  1:34 ` [patch 034/143] mm/hugeltb: remove redundant VM_BUG_ON() in region_add() Andrew Morton
2021-05-05  1:34 ` [patch 035/143] mm/hugeltb: simplify the return code of __vma_reservation_common() Andrew Morton
2021-05-05  1:34 ` [patch 036/143] mm/hugeltb: clarify (chg - freed) won't go negative in hugetlb_unreserve_pages() Andrew Morton
2021-05-05  1:34 ` [patch 037/143] mm/hugeltb: handle the error case in hugetlb_fix_reserve_counts() Andrew Morton
2021-05-05  1:34 ` [patch 038/143] mm/hugetlb: remove unused variable pseudo_vma in remove_inode_hugepages() Andrew Morton
2021-05-05  1:34 ` [patch 039/143] mm/cma: change cma mutex to irq safe spinlock Andrew Morton
2021-05-05  1:34 ` [patch 040/143] hugetlb: no need to drop hugetlb_lock to call cma_release Andrew Morton
2021-05-05  1:34 ` [patch 041/143] hugetlb: add per-hstate mutex to synchronize user adjustments Andrew Morton
2021-05-05  1:34 ` [patch 042/143] hugetlb: create remove_hugetlb_page() to separate functionality Andrew Morton
2021-05-05  1:34 ` [patch 043/143] hugetlb: call update_and_free_page without hugetlb_lock Andrew Morton
2021-05-05  1:35 ` [patch 044/143] hugetlb: change free_pool_huge_page to remove_pool_huge_page Andrew Morton
2021-05-05  1:35 ` [patch 045/143] hugetlb: make free_huge_page irq safe Andrew Morton
2021-05-05  1:35 ` [patch 046/143] hugetlb: add lockdep_assert_held() calls for hugetlb_lock Andrew Morton
2021-05-05  1:35 ` [patch 047/143] mm,page_alloc: bail out earlier on -ENOMEM in alloc_contig_migrate_range Andrew Morton
2021-05-05  1:35 ` [patch 048/143] mm,compaction: let isolate_migratepages_{range,block} return error codes Andrew Morton
2021-05-05  1:35 ` [patch 049/143] mm,hugetlb: drop clearing of flag from prep_new_huge_page Andrew Morton
2021-05-05  1:35 ` [patch 050/143] mm,hugetlb: split prep_new_huge_page functionality Andrew Morton
2021-05-05  1:35 ` [patch 051/143] mm: make alloc_contig_range handle free hugetlb pages Andrew Morton
2021-05-05  1:35 ` [patch 052/143] mm: make alloc_contig_range handle in-use " Andrew Morton
2021-05-05  1:35 ` [patch 053/143] mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig Andrew Morton
2021-05-05  1:35 ` [patch 054/143] userfaultfd: add minor fault registration mode Andrew Morton
2021-05-05  1:35 ` [patch 055/143] userfaultfd: disable huge PMD sharing for MINOR registered VMAs Andrew Morton
2021-05-05  1:35 ` [patch 056/143] userfaultfd: hugetlbfs: only compile UFFD helpers if config enabled Andrew Morton
2021-05-05  1:35 ` [patch 057/143] userfaultfd: add UFFDIO_CONTINUE ioctl Andrew Morton
2021-05-05  1:35 ` [patch 058/143] userfaultfd: update documentation to describe minor fault handling Andrew Morton
2021-05-05  1:35 ` [patch 059/143] userfaultfd/selftests: add test exercising " Andrew Morton
2021-05-05  1:36 ` [patch 060/143] mm/vmscan: move RECLAIM* bits to uapi header Andrew Morton
2021-05-05  1:36 ` Andrew Morton [this message]
2021-05-05  1:36 ` [patch 062/143] mm: vmscan: use nid from shrink_control for tracepoint Andrew Morton
2021-05-05  1:36 ` [patch 063/143] mm: vmscan: consolidate shrinker_maps handling code Andrew Morton
2021-05-05  1:36 ` [patch 064/143] mm: vmscan: use shrinker_rwsem to protect shrinker_maps allocation Andrew Morton
2021-05-05  1:36 ` [patch 065/143] mm: vmscan: remove memcg_shrinker_map_size Andrew Morton
2021-05-05  1:36 ` [patch 066/143] mm: vmscan: use kvfree_rcu instead of call_rcu Andrew Morton
2021-05-05  1:36 ` [patch 067/143] mm: memcontrol: rename shrinker_map to shrinker_info Andrew Morton
2021-05-05  1:36 ` [patch 068/143] mm: vmscan: add shrinker_info_protected() helper Andrew Morton
2021-05-05  1:36 ` [patch 069/143] mm: vmscan: use a new flag to indicate shrinker is registered Andrew Morton
2021-05-05  1:36 ` [patch 070/143] mm: vmscan: add per memcg shrinker nr_deferred Andrew Morton
2021-05-05  1:36 ` [patch 071/143] mm: vmscan: use per memcg nr_deferred of shrinker Andrew Morton
2021-05-05  1:36 ` [patch 072/143] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Andrew Morton
2021-05-05  1:36 ` [patch 073/143] mm: memcontrol: reparent nr_deferred when memcg offline Andrew Morton
2021-05-05  1:36 ` [patch 074/143] mm: vmscan: shrink deferred objects proportional to priority Andrew Morton
2021-05-05  1:36 ` [patch 075/143] mm/compaction: remove unused variable sysctl_compact_memory Andrew Morton
2021-05-05  1:36 ` [patch 076/143] mm: compaction: update the COMPACT[STALL|FAIL] events properly Andrew Morton
2021-05-05  1:36 ` [patch 077/143] mm: disable LRU pagevec during the migration temporarily Andrew Morton
2021-05-05  1:36 ` [patch 078/143] mm: replace migrate_[prep|finish] with lru_cache_[disable|enable] Andrew Morton
2021-05-05  1:37 ` [patch 079/143] mm: fs: invalidate BH LRU during page migration Andrew Morton
2021-05-05  1:37 ` [patch 080/143] mm/migrate.c: make putback_movable_page() static Andrew Morton
2021-05-05  1:37 ` [patch 081/143] mm/migrate.c: remove unnecessary rc != MIGRATEPAGE_SUCCESS check in 'else' case Andrew Morton
2021-05-05  1:37 ` [patch 082/143] mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page() Andrew Morton
2021-05-05  1:37 ` [patch 083/143] mm/migrate.c: use helper migrate_vma_collect_skip() in migrate_vma_collect_hole() Andrew Morton
2021-05-05  1:37 ` [patch 084/143] Revert "mm: migrate: skip shared exec THP for NUMA balancing" Andrew Morton
2021-05-05  1:37 ` [patch 085/143] mm: vmstat: add cma statistics Andrew Morton
2021-05-05  1:37 ` [patch 086/143] mm: cma: use pr_err_ratelimited for CMA warning Andrew Morton
2021-05-05  1:37 ` [patch 087/143] mm: cma: add trace events for CMA alloc perf testing Andrew Morton
2021-05-05  1:37 ` [patch 088/143] mm: cma: support sysfs Andrew Morton
2021-05-05  1:37 ` [patch 089/143] mm: cma: add the CMA instance name to cma trace events Andrew Morton
2021-05-05  1:37 ` [patch 090/143] mm: use proper type for cma_[alloc|release] Andrew Morton
2021-05-05  1:37 ` [patch 091/143] ksm: remove redundant VM_BUG_ON_PAGE() on stable_tree_search() Andrew Morton
2021-05-05  1:37 ` [patch 092/143] ksm: use GET_KSM_PAGE_NOLOCK to get ksm page in remove_rmap_item_from_tree() Andrew Morton
2021-05-05  1:37 ` [patch 093/143] ksm: remove dedicated macro KSM_FLAG_MASK Andrew Morton
2021-05-05  1:37 ` [patch 094/143] ksm: fix potential missing rmap_item for stable_node Andrew Morton
2021-05-05  1:37 ` [patch 095/143] mm/ksm: remove unused parameter from remove_trailing_rmap_items() Andrew Morton
2021-05-05  1:37 ` [patch 096/143] mm: restore node stat checking in /proc/sys/vm/stat_refresh Andrew Morton
2021-05-05  1:37 ` [patch 097/143] mm: no more EINVAL from /proc/sys/vm/stat_refresh Andrew Morton
2021-05-05  1:37 ` [patch 098/143] mm: /proc/sys/vm/stat_refresh skip checking known negative stats Andrew Morton
2021-05-05  1:38 ` [patch 099/143] mm: /proc/sys/vm/stat_refresh stop checking monotonic numa stats Andrew Morton
2021-05-05  1:38 ` [patch 100/143] x86/mm: track linear mapping split events Andrew Morton
2021-05-05  1:38 ` [patch 101/143] mm/mmap.c: don't unlock VMAs in remap_file_pages() Andrew Morton
2021-05-05  1:38 ` [patch 102/143] mm: generalize ARCH_HAS_CACHE_LINE_SIZE Andrew Morton
2021-05-05  1:38 ` [patch 104/143] mm: generalize ARCH_ENABLE_MEMORY_[HOTPLUG|HOTREMOVE] Andrew Morton
2021-05-05  1:38 ` [patch 105/143] mm: drop redundant ARCH_ENABLE_[HUGEPAGE|THP]_MIGRATION Andrew Morton
2021-05-05  1:38 ` [patch 108/143] mm/util.c: reduce mem_dump_obj() object size Andrew Morton
2021-05-05  1:38 ` [patch 109/143] mm/util.c: fix typo Andrew Morton
2021-05-05  1:38 ` [patch 110/143] mm/gup: don't pin migrated cma pages in movable zone Andrew Morton
2021-05-05  1:38 ` [patch 111/143] mm/gup: check every subpage of a compound page during isolation Andrew Morton
2021-05-05  1:38 ` [patch 112/143] mm/gup: return an error on migration failure Andrew Morton
2021-05-05  1:38 ` [patch 113/143] mm/gup: check for isolation errors Andrew Morton
2021-05-05  1:38 ` [patch 114/143] mm cma: rename PF_MEMALLOC_NOCMA to PF_MEMALLOC_PIN Andrew Morton
2021-05-05  1:38 ` [patch 115/143] mm: apply per-task gfp constraints in fast path Andrew Morton
2021-05-05  1:39 ` [patch 116/143] mm: honor PF_MEMALLOC_PIN for all movable pages Andrew Morton
2021-05-05  1:39 ` [patch 117/143] mm/gup: do not migrate zero page Andrew Morton
2021-05-05  1:39 ` [patch 118/143] mm/gup: migrate pinned pages out of movable zone Andrew Morton
2021-05-05  1:39 ` [patch 119/143] memory-hotplug.rst: add a note about ZONE_MOVABLE and page pinning Andrew Morton
2021-05-05  1:39 ` [patch 120/143] mm/gup: change index type to long as it counts pages Andrew Morton
2021-05-05  1:39 ` [patch 121/143] mm/gup: longterm pin migration cleanup Andrew Morton
2021-05-05  1:39 ` [patch 122/143] selftests/vm: gup_test: fix test flag Andrew Morton
2021-05-05  1:39 ` [patch 123/143] selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages Andrew Morton
2021-05-05  1:39 ` [patch 124/143] mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove Andrew Morton
2021-05-05  1:39 ` [patch 125/143] drivers/base/memory: introduce memory_block_{online,offline} Andrew Morton
2021-05-05  1:39 ` [patch 126/143] mm,memory_hotplug: relax fully spanned sections check Andrew Morton
2021-05-05  1:39 ` [patch 127/143] mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count() Andrew Morton
2021-05-05  1:39 ` [patch 128/143] mm,memory_hotplug: allocate memmap from the added memory range Andrew Morton
2021-05-05  1:39 ` [patch 129/143] acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported Andrew Morton
2021-05-05  1:39 ` [patch 130/143] mm,memory_hotplug: add kernel boot option to enable memmap_on_memory Andrew Morton
2021-05-05  1:39 ` [patch 131/143] x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE Andrew Morton
2021-05-05  1:39 ` [patch 132/143] arm64/Kconfig: " Andrew Morton
2021-05-05  1:39 ` [patch 133/143] mm/zswap.c: switch from strlcpy to strscpy Andrew Morton
2021-05-05  1:40 ` [patch 134/143] mm/zsmalloc: use BUG_ON instead of if condition followed by BUG Andrew Morton
2021-05-05  1:40 ` [patch 135/143] iov_iter: lift memzero_page() to highmem.h Andrew Morton
2021-05-05  1:40 ` [patch 136/143] btrfs: use memzero_page() instead of open coded kmap pattern Andrew Morton
2021-05-05  1:40 ` [patch 137/143] mm/highmem.c: fix coding style issue Andrew Morton
2021-05-05  1:40 ` [patch 138/143] mm/mempool: minor coding style tweaks Andrew Morton
2021-05-05  1:40 ` [patch 139/143] mm/process_vm_access.c: remove duplicate include Andrew Morton
2021-05-05  1:40 ` [patch 140/143] kfence: zero guard page after out-of-bounds access Andrew Morton
2021-05-05  1:40 ` [patch 141/143] kfence: await for allocation using wait_event Andrew Morton
2021-05-05  1:40 ` [patch 142/143] kfence: maximize allocation wait timeout duration Andrew Morton
2021-05-05  1:40 ` [patch 143/143] kfence: use power-efficient work queue to run delayed work Andrew Morton
2021-05-05  1:47 ` incoming Linus Torvalds
2021-05-05  3:16   ` incoming Andrew Morton
2021-05-05 17:10     ` incoming Linus Torvalds
2021-05-05 17:44       ` incoming Andrew Morton
2021-05-06  3:19         ` incoming Anshuman Khandual

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