mm/compaction.c:799:1: warning: stack frame size (2080) exceeds limit (2048) in function 'isolate_migratepages_block'
From: kernel test robot
Date: Sun Jul 04 2021 - 01:43:13 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 303392fd5c160822bf778270b28ec5ea50cab2b4
commit: b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee mm: memcontrol: use obj_cgroup APIs to charge kmem pages
date: 9 weeks ago
config: powerpc64-randconfig-r031-20210704 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project cb5de7c813f976dd458bd2a7f40702ba648bf650)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
In file included from mm/compaction.c:11:
In file included from include/linux/cpu.h:17:
In file included from include/linux/node.h:18:
In file included from include/linux/device.h:15:
In file included from include/linux/dev_printk.h:16:
In file included from include/linux/ratelimit.h:6:
In file included from include/linux/sched.h:12:
In file included from arch/powerpc/include/asm/current.h:13:
In file included from arch/powerpc/include/asm/paca.h:17:
In file included from arch/powerpc/include/asm/lppaca.h:46:
In file included from arch/powerpc/include/asm/mmu.h:147:
In file included from include/linux/bug.h:5:
In file included from arch/powerpc/include/asm/bug.h:109:
In file included from include/asm-generic/bug.h:20:
In file included from include/linux/kernel.h:11:
In file included from include/linux/bitops.h:32:
In file included from arch/powerpc/include/asm/bitops.h:62:
arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
#define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
^
<built-in>:309:9: note: previous definition is here
#define __lwsync __builtin_ppc_lwsync
^
>> mm/compaction.c:799:1: warning: stack frame size (2080) exceeds limit (2048) in function 'isolate_migratepages_block' [-Wframe-larger-than]
isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
^
2 warnings generated.
vim +/isolate_migratepages_block +799 mm/compaction.c
748446bb6b5a93 Mel Gorman 2010-05-24 779
2fe86e00040761 Michal Nazarewicz 2012-01-30 780 /**
edc2ca61249679 Vlastimil Babka 2014-10-09 781 * isolate_migratepages_block() - isolate all migrate-able pages within
edc2ca61249679 Vlastimil Babka 2014-10-09 782 * a single pageblock
2fe86e00040761 Michal Nazarewicz 2012-01-30 783 * @cc: Compaction control structure.
edc2ca61249679 Vlastimil Babka 2014-10-09 784 * @low_pfn: The first PFN to isolate
edc2ca61249679 Vlastimil Babka 2014-10-09 785 * @end_pfn: The one-past-the-last PFN to isolate, within same pageblock
edc2ca61249679 Vlastimil Babka 2014-10-09 786 * @isolate_mode: Isolation mode to be used.
2fe86e00040761 Michal Nazarewicz 2012-01-30 787 *
2fe86e00040761 Michal Nazarewicz 2012-01-30 788 * Isolate all pages that can be migrated from the range specified by
edc2ca61249679 Vlastimil Babka 2014-10-09 789 * [low_pfn, end_pfn). The range is expected to be within same pageblock.
edc2ca61249679 Vlastimil Babka 2014-10-09 790 * Returns zero if there is a fatal signal pending, otherwise PFN of the
edc2ca61249679 Vlastimil Babka 2014-10-09 791 * first page that was not scanned (which may be both less, equal to or more
edc2ca61249679 Vlastimil Babka 2014-10-09 792 * than end_pfn).
2fe86e00040761 Michal Nazarewicz 2012-01-30 793 *
edc2ca61249679 Vlastimil Babka 2014-10-09 794 * The pages are isolated on cc->migratepages list (not required to be empty),
edc2ca61249679 Vlastimil Babka 2014-10-09 795 * and cc->nr_migratepages is updated accordingly. The cc->migrate_pfn field
edc2ca61249679 Vlastimil Babka 2014-10-09 796 * is neither read nor updated.
748446bb6b5a93 Mel Gorman 2010-05-24 797 */
edc2ca61249679 Vlastimil Babka 2014-10-09 798 static unsigned long
edc2ca61249679 Vlastimil Babka 2014-10-09 @799 isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
edc2ca61249679 Vlastimil Babka 2014-10-09 800 unsigned long end_pfn, isolate_mode_t isolate_mode)
748446bb6b5a93 Mel Gorman 2010-05-24 801 {
5f438eee8f2e97 Andrey Ryabinin 2019-03-05 802 pg_data_t *pgdat = cc->zone->zone_pgdat;
b7aba6984dc048 Mel Gorman 2011-01-13 803 unsigned long nr_scanned = 0, nr_isolated = 0;
fa9add641b1b1c Hugh Dickins 2012-05-29 804 struct lruvec *lruvec;
b8b2d825323633 Xiubo Li 2014-10-09 805 unsigned long flags = 0;
6168d0da2b479c Alex Shi 2020-12-15 806 struct lruvec *locked = NULL;
bb13ffeb9f6bfe Mel Gorman 2012-10-08 807 struct page *page = NULL, *valid_page = NULL;
e34d85f0e3c60f Joonsoo Kim 2015-02-11 808 unsigned long start_pfn = low_pfn;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 809 bool skip_on_failure = false;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 810 unsigned long next_skip_pfn = 0;
e380bebe477154 Mel Gorman 2019-03-05 811 bool skip_updated = false;
748446bb6b5a93 Mel Gorman 2010-05-24 812
748446bb6b5a93 Mel Gorman 2010-05-24 813 /*
748446bb6b5a93 Mel Gorman 2010-05-24 814 * Ensure that there are not too many pages isolated from the LRU
748446bb6b5a93 Mel Gorman 2010-05-24 815 * list by either parallel reclaimers or compaction. If there are,
748446bb6b5a93 Mel Gorman 2010-05-24 816 * delay for some time until fewer pages are isolated
748446bb6b5a93 Mel Gorman 2010-05-24 817 */
5f438eee8f2e97 Andrey Ryabinin 2019-03-05 818 while (unlikely(too_many_isolated(pgdat))) {
d20bdd571ee5c9 Zi Yan 2020-11-13 819 /* stop isolation if there are still pages not migrated */
d20bdd571ee5c9 Zi Yan 2020-11-13 820 if (cc->nr_migratepages)
d20bdd571ee5c9 Zi Yan 2020-11-13 821 return 0;
d20bdd571ee5c9 Zi Yan 2020-11-13 822
f9e35b3b41f47c Mel Gorman 2011-06-15 823 /* async migration should just abort */
e0b9daeb453e60 David Rientjes 2014-06-04 824 if (cc->mode == MIGRATE_ASYNC)
2fe86e00040761 Michal Nazarewicz 2012-01-30 825 return 0;
f9e35b3b41f47c Mel Gorman 2011-06-15 826
748446bb6b5a93 Mel Gorman 2010-05-24 827 congestion_wait(BLK_RW_ASYNC, HZ/10);
748446bb6b5a93 Mel Gorman 2010-05-24 828
748446bb6b5a93 Mel Gorman 2010-05-24 829 if (fatal_signal_pending(current))
2fe86e00040761 Michal Nazarewicz 2012-01-30 830 return 0;
748446bb6b5a93 Mel Gorman 2010-05-24 831 }
748446bb6b5a93 Mel Gorman 2010-05-24 832
cf66f0700c8f1d Mel Gorman 2019-03-05 833 cond_resched();
aeef4b83806f49 David Rientjes 2014-06-04 834
fdd048e12c9a46 Vlastimil Babka 2016-05-19 835 if (cc->direct_compaction && (cc->mode == MIGRATE_ASYNC)) {
fdd048e12c9a46 Vlastimil Babka 2016-05-19 836 skip_on_failure = true;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 837 next_skip_pfn = block_end_pfn(low_pfn, cc->order);
fdd048e12c9a46 Vlastimil Babka 2016-05-19 838 }
fdd048e12c9a46 Vlastimil Babka 2016-05-19 839
748446bb6b5a93 Mel Gorman 2010-05-24 840 /* Time to isolate some pages for migration */
748446bb6b5a93 Mel Gorman 2010-05-24 841 for (; low_pfn < end_pfn; low_pfn++) {
29c0dde830f8c0 Vlastimil Babka 2015-09-08 842
fdd048e12c9a46 Vlastimil Babka 2016-05-19 843 if (skip_on_failure && low_pfn >= next_skip_pfn) {
fdd048e12c9a46 Vlastimil Babka 2016-05-19 844 /*
fdd048e12c9a46 Vlastimil Babka 2016-05-19 845 * We have isolated all migration candidates in the
fdd048e12c9a46 Vlastimil Babka 2016-05-19 846 * previous order-aligned block, and did not skip it due
fdd048e12c9a46 Vlastimil Babka 2016-05-19 847 * to failure. We should migrate the pages now and
fdd048e12c9a46 Vlastimil Babka 2016-05-19 848 * hopefully succeed compaction.
fdd048e12c9a46 Vlastimil Babka 2016-05-19 849 */
fdd048e12c9a46 Vlastimil Babka 2016-05-19 850 if (nr_isolated)
fdd048e12c9a46 Vlastimil Babka 2016-05-19 851 break;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 852
fdd048e12c9a46 Vlastimil Babka 2016-05-19 853 /*
fdd048e12c9a46 Vlastimil Babka 2016-05-19 854 * We failed to isolate in the previous order-aligned
fdd048e12c9a46 Vlastimil Babka 2016-05-19 855 * block. Set the new boundary to the end of the
fdd048e12c9a46 Vlastimil Babka 2016-05-19 856 * current block. Note we can't simply increase
fdd048e12c9a46 Vlastimil Babka 2016-05-19 857 * next_skip_pfn by 1 << order, as low_pfn might have
fdd048e12c9a46 Vlastimil Babka 2016-05-19 858 * been incremented by a higher number due to skipping
fdd048e12c9a46 Vlastimil Babka 2016-05-19 859 * a compound or a high-order buddy page in the
fdd048e12c9a46 Vlastimil Babka 2016-05-19 860 * previous loop iteration.
fdd048e12c9a46 Vlastimil Babka 2016-05-19 861 */
fdd048e12c9a46 Vlastimil Babka 2016-05-19 862 next_skip_pfn = block_end_pfn(low_pfn, cc->order);
fdd048e12c9a46 Vlastimil Babka 2016-05-19 863 }
fdd048e12c9a46 Vlastimil Babka 2016-05-19 864
8b44d2791f9125 Vlastimil Babka 2014-10-09 865 /*
8b44d2791f9125 Vlastimil Babka 2014-10-09 866 * Periodically drop the lock (if held) regardless of its
670105a25608af Mel Gorman 2019-08-02 867 * contention, to give chance to IRQs. Abort completely if
670105a25608af Mel Gorman 2019-08-02 868 * a fatal signal is pending.
8b44d2791f9125 Vlastimil Babka 2014-10-09 869 */
6168d0da2b479c Alex Shi 2020-12-15 870 if (!(low_pfn % SWAP_CLUSTER_MAX)) {
6168d0da2b479c Alex Shi 2020-12-15 871 if (locked) {
6168d0da2b479c Alex Shi 2020-12-15 872 unlock_page_lruvec_irqrestore(locked, flags);
6168d0da2b479c Alex Shi 2020-12-15 873 locked = NULL;
6168d0da2b479c Alex Shi 2020-12-15 874 }
6168d0da2b479c Alex Shi 2020-12-15 875
6168d0da2b479c Alex Shi 2020-12-15 876 if (fatal_signal_pending(current)) {
6168d0da2b479c Alex Shi 2020-12-15 877 cc->contended = true;
6168d0da2b479c Alex Shi 2020-12-15 878
670105a25608af Mel Gorman 2019-08-02 879 low_pfn = 0;
670105a25608af Mel Gorman 2019-08-02 880 goto fatal_pending;
670105a25608af Mel Gorman 2019-08-02 881 }
b2eef8c0d09101 Andrea Arcangeli 2011-03-22 882
6168d0da2b479c Alex Shi 2020-12-15 883 cond_resched();
6168d0da2b479c Alex Shi 2020-12-15 884 }
6168d0da2b479c Alex Shi 2020-12-15 885
748446bb6b5a93 Mel Gorman 2010-05-24 886 if (!pfn_valid_within(low_pfn))
fdd048e12c9a46 Vlastimil Babka 2016-05-19 887 goto isolate_fail;
b7aba6984dc048 Mel Gorman 2011-01-13 888 nr_scanned++;
748446bb6b5a93 Mel Gorman 2010-05-24 889
748446bb6b5a93 Mel Gorman 2010-05-24 890 page = pfn_to_page(low_pfn);
dc9086004b3d5d Mel Gorman 2012-02-08 891
e380bebe477154 Mel Gorman 2019-03-05 892 /*
e380bebe477154 Mel Gorman 2019-03-05 893 * Check if the pageblock has already been marked skipped.
e380bebe477154 Mel Gorman 2019-03-05 894 * Only the aligned PFN is checked as the caller isolates
e380bebe477154 Mel Gorman 2019-03-05 895 * COMPACT_CLUSTER_MAX at a time so the second call must
e380bebe477154 Mel Gorman 2019-03-05 896 * not falsely conclude that the block should be skipped.
e380bebe477154 Mel Gorman 2019-03-05 897 */
e380bebe477154 Mel Gorman 2019-03-05 898 if (!valid_page && IS_ALIGNED(low_pfn, pageblock_nr_pages)) {
e380bebe477154 Mel Gorman 2019-03-05 899 if (!cc->ignore_skip_hint && get_pageblock_skip(page)) {
e380bebe477154 Mel Gorman 2019-03-05 900 low_pfn = end_pfn;
9df41314390b81 Alex Shi 2020-12-15 901 page = NULL;
e380bebe477154 Mel Gorman 2019-03-05 902 goto isolate_abort;
e380bebe477154 Mel Gorman 2019-03-05 903 }
bb13ffeb9f6bfe Mel Gorman 2012-10-08 904 valid_page = page;
e380bebe477154 Mel Gorman 2019-03-05 905 }
bb13ffeb9f6bfe Mel Gorman 2012-10-08 906
c122b2087ab941 Joonsoo Kim 2014-04-07 907 /*
99c0fd5e51c447 Vlastimil Babka 2014-10-09 908 * Skip if free. We read page order here without zone lock
99c0fd5e51c447 Vlastimil Babka 2014-10-09 909 * which is generally unsafe, but the race window is small and
99c0fd5e51c447 Vlastimil Babka 2014-10-09 910 * the worst thing that can happen is that we skip some
99c0fd5e51c447 Vlastimil Babka 2014-10-09 911 * potential isolation targets.
99c0fd5e51c447 Vlastimil Babka 2014-10-09 912 */
99c0fd5e51c447 Vlastimil Babka 2014-10-09 913 if (PageBuddy(page)) {
ab130f9108dcf2 Matthew Wilcox (Oracle 2020-10-15 914) unsigned long freepage_order = buddy_order_unsafe(page);
99c0fd5e51c447 Vlastimil Babka 2014-10-09 915
99c0fd5e51c447 Vlastimil Babka 2014-10-09 916 /*
99c0fd5e51c447 Vlastimil Babka 2014-10-09 917 * Without lock, we cannot be sure that what we got is
99c0fd5e51c447 Vlastimil Babka 2014-10-09 918 * a valid page order. Consider only values in the
99c0fd5e51c447 Vlastimil Babka 2014-10-09 919 * valid order range to prevent low_pfn overflow.
c122b2087ab941 Joonsoo Kim 2014-04-07 920 */
99c0fd5e51c447 Vlastimil Babka 2014-10-09 921 if (freepage_order > 0 && freepage_order < MAX_ORDER)
99c0fd5e51c447 Vlastimil Babka 2014-10-09 922 low_pfn += (1UL << freepage_order) - 1;
c122b2087ab941 Joonsoo Kim 2014-04-07 923 continue;
99c0fd5e51c447 Vlastimil Babka 2014-10-09 924 }
9927af740b1b9b Mel Gorman 2011-01-13 925
bc835011afbea3 Andrea Arcangeli 2011-01-13 926 /*
29c0dde830f8c0 Vlastimil Babka 2015-09-08 927 * Regardless of being on LRU, compound pages such as THP and
1da2f328fa643b Rik van Riel 2020-04-01 928 * hugetlbfs are not to be compacted unless we are attempting
1da2f328fa643b Rik van Riel 2020-04-01 929 * an allocation much larger than the huge page size (eg CMA).
1da2f328fa643b Rik van Riel 2020-04-01 930 * We can potentially save a lot of iterations if we skip them
1da2f328fa643b Rik van Riel 2020-04-01 931 * at once. The check is racy, but we can consider only valid
1da2f328fa643b Rik van Riel 2020-04-01 932 * values and the only danger is skipping too much.
bc835011afbea3 Andrea Arcangeli 2011-01-13 933 */
1da2f328fa643b Rik van Riel 2020-04-01 934 if (PageCompound(page) && !cc->alloc_contig) {
21dc7e023611fb David Rientjes 2017-11-17 935 const unsigned int order = compound_order(page);
edc2ca61249679 Vlastimil Babka 2014-10-09 936
d3c85bad89b915 Vlastimil Babka 2017-11-17 937 if (likely(order < MAX_ORDER))
21dc7e023611fb David Rientjes 2017-11-17 938 low_pfn += (1UL << order) - 1;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 939 goto isolate_fail;
2a1402aa044b55 Mel Gorman 2012-10-08 940 }
2a1402aa044b55 Mel Gorman 2012-10-08 941
bda807d4445414 Minchan Kim 2016-07-26 942 /*
bda807d4445414 Minchan Kim 2016-07-26 943 * Check may be lockless but that's ok as we recheck later.
bda807d4445414 Minchan Kim 2016-07-26 944 * It's possible to migrate LRU and non-lru movable pages.
bda807d4445414 Minchan Kim 2016-07-26 945 * Skip any other type of page
bda807d4445414 Minchan Kim 2016-07-26 946 */
bda807d4445414 Minchan Kim 2016-07-26 947 if (!PageLRU(page)) {
bda807d4445414 Minchan Kim 2016-07-26 948 /*
bda807d4445414 Minchan Kim 2016-07-26 949 * __PageMovable can return false positive so we need
bda807d4445414 Minchan Kim 2016-07-26 950 * to verify it under page_lock.
bda807d4445414 Minchan Kim 2016-07-26 951 */
bda807d4445414 Minchan Kim 2016-07-26 952 if (unlikely(__PageMovable(page)) &&
bda807d4445414 Minchan Kim 2016-07-26 953 !PageIsolated(page)) {
bda807d4445414 Minchan Kim 2016-07-26 954 if (locked) {
6168d0da2b479c Alex Shi 2020-12-15 955 unlock_page_lruvec_irqrestore(locked, flags);
6168d0da2b479c Alex Shi 2020-12-15 956 locked = NULL;
bda807d4445414 Minchan Kim 2016-07-26 957 }
bda807d4445414 Minchan Kim 2016-07-26 958
9e5bcd610ffced Yisheng Xie 2017-02-24 959 if (!isolate_movable_page(page, isolate_mode))
bda807d4445414 Minchan Kim 2016-07-26 960 goto isolate_success;
bda807d4445414 Minchan Kim 2016-07-26 961 }
bda807d4445414 Minchan Kim 2016-07-26 962
fdd048e12c9a46 Vlastimil Babka 2016-05-19 963 goto isolate_fail;
bda807d4445414 Minchan Kim 2016-07-26 964 }
29c0dde830f8c0 Vlastimil Babka 2015-09-08 965
119d6d59dcc098 David Rientjes 2014-04-03 966 /*
119d6d59dcc098 David Rientjes 2014-04-03 967 * Migration will fail if an anonymous page is pinned in memory,
119d6d59dcc098 David Rientjes 2014-04-03 968 * so avoid taking lru_lock and isolating it unnecessarily in an
119d6d59dcc098 David Rientjes 2014-04-03 969 * admittedly racy check.
119d6d59dcc098 David Rientjes 2014-04-03 970 */
119d6d59dcc098 David Rientjes 2014-04-03 971 if (!page_mapping(page) &&
119d6d59dcc098 David Rientjes 2014-04-03 972 page_count(page) > page_mapcount(page))
fdd048e12c9a46 Vlastimil Babka 2016-05-19 973 goto isolate_fail;
119d6d59dcc098 David Rientjes 2014-04-03 974
73e64c51afc56d Michal Hocko 2016-12-14 975 /*
73e64c51afc56d Michal Hocko 2016-12-14 976 * Only allow to migrate anonymous pages in GFP_NOFS context
73e64c51afc56d Michal Hocko 2016-12-14 977 * because those do not depend on fs locks.
73e64c51afc56d Michal Hocko 2016-12-14 978 */
73e64c51afc56d Michal Hocko 2016-12-14 979 if (!(cc->gfp_mask & __GFP_FS) && page_mapping(page))
73e64c51afc56d Michal Hocko 2016-12-14 980 goto isolate_fail;
73e64c51afc56d Michal Hocko 2016-12-14 981
9df41314390b81 Alex Shi 2020-12-15 982 /*
9df41314390b81 Alex Shi 2020-12-15 983 * Be careful not to clear PageLRU until after we're
9df41314390b81 Alex Shi 2020-12-15 984 * sure the page is not being freed elsewhere -- the
9df41314390b81 Alex Shi 2020-12-15 985 * page release code relies on it.
9df41314390b81 Alex Shi 2020-12-15 986 */
9df41314390b81 Alex Shi 2020-12-15 987 if (unlikely(!get_page_unless_zero(page)))
9df41314390b81 Alex Shi 2020-12-15 988 goto isolate_fail;
9df41314390b81 Alex Shi 2020-12-15 989
c2135f7c570bc2 Alex Shi 2021-02-24 990 if (!__isolate_lru_page_prepare(page, isolate_mode))
9df41314390b81 Alex Shi 2020-12-15 991 goto isolate_fail_put;
9df41314390b81 Alex Shi 2020-12-15 992
9df41314390b81 Alex Shi 2020-12-15 993 /* Try isolate the page */
9df41314390b81 Alex Shi 2020-12-15 994 if (!TestClearPageLRU(page))
9df41314390b81 Alex Shi 2020-12-15 995 goto isolate_fail_put;
9df41314390b81 Alex Shi 2020-12-15 996
6168d0da2b479c Alex Shi 2020-12-15 997 lruvec = mem_cgroup_page_lruvec(page, pgdat);
6168d0da2b479c Alex Shi 2020-12-15 998
69b7189f12e006 Vlastimil Babka 2014-10-09 999 /* If we already hold the lock, we can skip some rechecking */
6168d0da2b479c Alex Shi 2020-12-15 1000 if (lruvec != locked) {
6168d0da2b479c Alex Shi 2020-12-15 1001 if (locked)
6168d0da2b479c Alex Shi 2020-12-15 1002 unlock_page_lruvec_irqrestore(locked, flags);
6168d0da2b479c Alex Shi 2020-12-15 1003
6168d0da2b479c Alex Shi 2020-12-15 1004 compact_lock_irqsave(&lruvec->lru_lock, &flags, cc);
6168d0da2b479c Alex Shi 2020-12-15 1005 locked = lruvec;
6168d0da2b479c Alex Shi 2020-12-15 1006
6168d0da2b479c Alex Shi 2020-12-15 1007 lruvec_memcg_debug(lruvec, page);
e380bebe477154 Mel Gorman 2019-03-05 1008
e380bebe477154 Mel Gorman 2019-03-05 1009 /* Try get exclusive access under lock */
e380bebe477154 Mel Gorman 2019-03-05 1010 if (!skip_updated) {
e380bebe477154 Mel Gorman 2019-03-05 1011 skip_updated = true;
e380bebe477154 Mel Gorman 2019-03-05 1012 if (test_and_set_skip(cc, page, low_pfn))
e380bebe477154 Mel Gorman 2019-03-05 1013 goto isolate_abort;
e380bebe477154 Mel Gorman 2019-03-05 1014 }
2a1402aa044b55 Mel Gorman 2012-10-08 1015
29c0dde830f8c0 Vlastimil Babka 2015-09-08 1016 /*
29c0dde830f8c0 Vlastimil Babka 2015-09-08 1017 * Page become compound since the non-locked check,
29c0dde830f8c0 Vlastimil Babka 2015-09-08 1018 * and it's on LRU. It can only be a THP so the order
29c0dde830f8c0 Vlastimil Babka 2015-09-08 1019 * is safe to read and it's 0 for tail pages.
29c0dde830f8c0 Vlastimil Babka 2015-09-08 1020 */
1da2f328fa643b Rik van Riel 2020-04-01 1021 if (unlikely(PageCompound(page) && !cc->alloc_contig)) {
d8c6546b1aea84 Matthew Wilcox (Oracle 2019-09-23 1022) low_pfn += compound_nr(page) - 1;
9df41314390b81 Alex Shi 2020-12-15 1023 SetPageLRU(page);
9df41314390b81 Alex Shi 2020-12-15 1024 goto isolate_fail_put;
bc835011afbea3 Andrea Arcangeli 2011-01-13 1025 }
d99fd5feb0ac1d Alex Shi 2021-02-24 1026 }
fa9add641b1b1c Hugh Dickins 2012-05-29 1027
1da2f328fa643b Rik van Riel 2020-04-01 1028 /* The whole page is taken off the LRU; skip the tail pages. */
1da2f328fa643b Rik van Riel 2020-04-01 1029 if (PageCompound(page))
1da2f328fa643b Rik van Riel 2020-04-01 1030 low_pfn += compound_nr(page) - 1;
bc835011afbea3 Andrea Arcangeli 2011-01-13 1031
748446bb6b5a93 Mel Gorman 2010-05-24 1032 /* Successfully isolated */
46ae6b2cc2a479 Yu Zhao 2021-02-24 1033 del_page_from_lru_list(page, lruvec);
1da2f328fa643b Rik van Riel 2020-04-01 1034 mod_node_page_state(page_pgdat(page),
9de4f22a60f731 Huang Ying 2020-04-06 1035 NR_ISOLATED_ANON + page_is_file_lru(page),
6c357848b44b40 Matthew Wilcox (Oracle 2020-08-14 1036) thp_nr_pages(page));
b6c750163c0d13 Joonsoo Kim 2014-04-07 1037
b6c750163c0d13 Joonsoo Kim 2014-04-07 1038 isolate_success:
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1039 list_add(&page->lru, &cc->migratepages);
38935861d85a4d Zi Yan 2020-11-13 1040 cc->nr_migratepages += compound_nr(page);
38935861d85a4d Zi Yan 2020-11-13 1041 nr_isolated += compound_nr(page);
748446bb6b5a93 Mel Gorman 2010-05-24 1042
804d3121ba5f03 Mel Gorman 2019-03-05 1043 /*
804d3121ba5f03 Mel Gorman 2019-03-05 1044 * Avoid isolating too much unless this block is being
cb2dcaf023c2cf Mel Gorman 2019-03-05 1045 * rescanned (e.g. dirty/writeback pages, parallel allocation)
cb2dcaf023c2cf Mel Gorman 2019-03-05 1046 * or a lock is contended. For contention, isolate quickly to
cb2dcaf023c2cf Mel Gorman 2019-03-05 1047 * potentially remove one source of contention.
804d3121ba5f03 Mel Gorman 2019-03-05 1048 */
38935861d85a4d Zi Yan 2020-11-13 1049 if (cc->nr_migratepages >= COMPACT_CLUSTER_MAX &&
cb2dcaf023c2cf Mel Gorman 2019-03-05 1050 !cc->rescan && !cc->contended) {
31b8384a555d94 Hillf Danton 2012-01-10 1051 ++low_pfn;
748446bb6b5a93 Mel Gorman 2010-05-24 1052 break;
748446bb6b5a93 Mel Gorman 2010-05-24 1053 }
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1054
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1055 continue;
9df41314390b81 Alex Shi 2020-12-15 1056
9df41314390b81 Alex Shi 2020-12-15 1057 isolate_fail_put:
9df41314390b81 Alex Shi 2020-12-15 1058 /* Avoid potential deadlock in freeing page under lru_lock */
9df41314390b81 Alex Shi 2020-12-15 1059 if (locked) {
6168d0da2b479c Alex Shi 2020-12-15 1060 unlock_page_lruvec_irqrestore(locked, flags);
6168d0da2b479c Alex Shi 2020-12-15 1061 locked = NULL;
9df41314390b81 Alex Shi 2020-12-15 1062 }
9df41314390b81 Alex Shi 2020-12-15 1063 put_page(page);
9df41314390b81 Alex Shi 2020-12-15 1064
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1065 isolate_fail:
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1066 if (!skip_on_failure)
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1067 continue;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1068
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1069 /*
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1070 * We have isolated some pages, but then failed. Release them
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1071 * instead of migrating, as we cannot form the cc->order buddy
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1072 * page anyway.
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1073 */
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1074 if (nr_isolated) {
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1075 if (locked) {
6168d0da2b479c Alex Shi 2020-12-15 1076 unlock_page_lruvec_irqrestore(locked, flags);
6168d0da2b479c Alex Shi 2020-12-15 1077 locked = NULL;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1078 }
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1079 putback_movable_pages(&cc->migratepages);
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1080 cc->nr_migratepages = 0;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1081 nr_isolated = 0;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1082 }
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1083
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1084 if (low_pfn < next_skip_pfn) {
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1085 low_pfn = next_skip_pfn - 1;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1086 /*
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1087 * The check near the loop beginning would have updated
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1088 * next_skip_pfn too, but this is a bit simpler.
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1089 */
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1090 next_skip_pfn += 1UL << cc->order;
fdd048e12c9a46 Vlastimil Babka 2016-05-19 1091 }
31b8384a555d94 Hillf Danton 2012-01-10 1092 }
748446bb6b5a93 Mel Gorman 2010-05-24 1093
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1094 /*
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1095 * The PageBuddy() check could have potentially brought us outside
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1096 * the range to be scanned.
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1097 */
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1098 if (unlikely(low_pfn > end_pfn))
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1099 low_pfn = end_pfn;
99c0fd5e51c447 Vlastimil Babka 2014-10-09 1100
9df41314390b81 Alex Shi 2020-12-15 1101 page = NULL;
9df41314390b81 Alex Shi 2020-12-15 1102
e380bebe477154 Mel Gorman 2019-03-05 1103 isolate_abort:
c67fe3752abe6a Mel Gorman 2012-08-21 1104 if (locked)
6168d0da2b479c Alex Shi 2020-12-15 1105 unlock_page_lruvec_irqrestore(locked, flags);
9df41314390b81 Alex Shi 2020-12-15 1106 if (page) {
9df41314390b81 Alex Shi 2020-12-15 1107 SetPageLRU(page);
9df41314390b81 Alex Shi 2020-12-15 1108 put_page(page);
9df41314390b81 Alex Shi 2020-12-15 1109 }
748446bb6b5a93 Mel Gorman 2010-05-24 1110
50b5b094e683f8 Vlastimil Babka 2014-01-21 1111 /*
804d3121ba5f03 Mel Gorman 2019-03-05 1112 * Updated the cached scanner pfn once the pageblock has been scanned
804d3121ba5f03 Mel Gorman 2019-03-05 1113 * Pages will either be migrated in which case there is no point
804d3121ba5f03 Mel Gorman 2019-03-05 1114 * scanning in the near future or migration failed in which case the
804d3121ba5f03 Mel Gorman 2019-03-05 1115 * failure reason may persist. The block is marked for skipping if
804d3121ba5f03 Mel Gorman 2019-03-05 1116 * there were no pages isolated in the block or if the block is
804d3121ba5f03 Mel Gorman 2019-03-05 1117 * rescanned twice in a row.
50b5b094e683f8 Vlastimil Babka 2014-01-21 1118 */
804d3121ba5f03 Mel Gorman 2019-03-05 1119 if (low_pfn == end_pfn && (!nr_isolated || cc->rescan)) {
e380bebe477154 Mel Gorman 2019-03-05 1120 if (valid_page && !skip_updated)
e380bebe477154 Mel Gorman 2019-03-05 1121 set_pageblock_skip(valid_page);
e380bebe477154 Mel Gorman 2019-03-05 1122 update_cached_migrate(cc, low_pfn);
e380bebe477154 Mel Gorman 2019-03-05 1123 }
bb13ffeb9f6bfe Mel Gorman 2012-10-08 1124
e34d85f0e3c60f Joonsoo Kim 2015-02-11 1125 trace_mm_compaction_isolate_migratepages(start_pfn, low_pfn,
e34d85f0e3c60f Joonsoo Kim 2015-02-11 1126 nr_scanned, nr_isolated);
b7aba6984dc048 Mel Gorman 2011-01-13 1127
670105a25608af Mel Gorman 2019-08-02 1128 fatal_pending:
7f354a548d1cb6 David Rientjes 2017-02-22 1129 cc->total_migrate_scanned += nr_scanned;
397487db696cae Mel Gorman 2012-10-19 1130 if (nr_isolated)
010fc29a45a2e8 Minchan Kim 2012-12-20 1131 count_compact_events(COMPACTISOLATED, nr_isolated);
397487db696cae Mel Gorman 2012-10-19 1132
2fe86e00040761 Michal Nazarewicz 2012-01-30 1133 return low_pfn;
2fe86e00040761 Michal Nazarewicz 2012-01-30 1134 }
2fe86e00040761 Michal Nazarewicz 2012-01-30 1135
:::::: The code at line 799 was first introduced by commit
:::::: edc2ca61249679298c1f343cd9c549964b8df4b4 mm, compaction: move pageblock checks up from isolate_migratepages_range()
:::::: TO: Vlastimil Babka <vbabka@xxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
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