diff options
Diffstat (limited to 'Correct-zone-boundary-handling-when-resetting-pageblock-skip-hints.patch')
| -rw-r--r-- | Correct-zone-boundary-handling-when-resetting-pageblock-skip-hints.patch | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/Correct-zone-boundary-handling-when-resetting-pageblock-skip-hints.patch b/Correct-zone-boundary-handling-when-resetting-pageblock-skip-hints.patch deleted file mode 100644 index c0eb9bcab..000000000 --- a/Correct-zone-boundary-handling-when-resetting-pageblock-skip-hints.patch +++ /dev/null @@ -1,113 +0,0 @@ -From patchwork Wed Mar 27 08:54:24 2019 -Date: Wed, 27 Mar 2019 08:54:24 +0000 -From: Mel Gorman <mgorman@techsingularity.net> -To: Andrew Morton <akpm@linux-foundation.org> -Cc: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>, - Daniel Jordan <daniel.m.jordan@oracle.com>, Qian Cai <cai@lca.pw>, - linux-mm@kvack.org, vbabka@suse.cz, linux-kernel@vger.kernel.org -Subject: [PATCH] Correct zone boundary handling when resetting pageblock skip - hints - -Mikhail Gavrilo reported the following bug being triggered in a Fedora -kernel based on 5.1-rc1 but it is relevant to a vanilla kernel. - - kernel: page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p)) - kernel: ------------[ cut here ]------------ - kernel: kernel BUG at include/linux/mm.h:1021! - kernel: invalid opcode: 0000 [#1] SMP NOPTI - kernel: CPU: 6 PID: 116 Comm: kswapd0 Tainted: G C 5.1.0-0.rc1.git1.3.fc31.x86_64 #1 - kernel: Hardware name: System manufacturer System Product Name/ROG STRIX X470-I GAMING, BIOS 1201 12/07/2018 - kernel: RIP: 0010:__reset_isolation_pfn+0x244/0x2b0 - kernel: Code: fe 06 e8 0f 8e fc ff 44 0f b6 4c 24 04 48 85 c0 0f 85 dc fe ff ff e9 68 fe ff ff 48 c7 c6 58 b7 2e 8c 4c 89 ff e8 0c 75 00 00 <0f> 0b 48 c7 c6 58 b7 2e 8c e8 fe 74 00 00 0f 0b 48 89 fa 41 b8 01 - kernel: RSP: 0018:ffff9e2d03f0fde8 EFLAGS: 00010246 - kernel: RAX: 0000000000000034 RBX: 000000000081f380 RCX: ffff8cffbddd6c20 - kernel: RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8cffbddd6c20 - kernel: RBP: 0000000000000001 R08: 0000009898b94613 R09: 0000000000000000 - kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000100000 - kernel: R13: 0000000000100000 R14: 0000000000000001 R15: ffffca7de07ce000 - kernel: FS: 0000000000000000(0000) GS:ffff8cffbdc00000(0000) knlGS:0000000000000000 - kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 - kernel: CR2: 00007fc1670e9000 CR3: 00000007f5276000 CR4: 00000000003406e0 - kernel: Call Trace: - kernel: __reset_isolation_suitable+0x62/0x120 - kernel: reset_isolation_suitable+0x3b/0x40 - kernel: kswapd+0x147/0x540 - kernel: ? finish_wait+0x90/0x90 - kernel: kthread+0x108/0x140 - kernel: ? balance_pgdat+0x560/0x560 - kernel: ? kthread_park+0x90/0x90 - kernel: ret_from_fork+0x27/0x50 - -He bisected it down to commit e332f741a8dd ("mm, compaction: be selective -about what pageblocks to clear skip hints"). The problem is that the patch -in question was sloppy with respect to the handling of zone boundaries. In -some instances, it was possible for PFNs outside of a zone to be examined -and if those were not properly initialised or poisoned then it would -trigger the VM_BUG_ON. This patch corrects the zone boundary issues when -resetting pageblock skip hints and Mikhail reported that the bug did not -trigger after 30 hours of testing. - -Fixes: e332f741a8dd ("mm, compaction: be selective about what pageblocks to clear skip hints") -Reported-and-tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> -Signed-off-by: Mel Gorman <mgorman@techsingularity.net> ---- - mm/compaction.c | 27 +++++++++++++++++---------- - 1 file changed, 17 insertions(+), 10 deletions(-) - -diff --git a/mm/compaction.c b/mm/compaction.c -index f171a83707ce..b4930bf93c8a 100644 ---- a/mm/compaction.c -+++ b/mm/compaction.c -@@ -242,6 +242,7 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source, - bool check_target) - { - struct page *page = pfn_to_online_page(pfn); -+ struct page *block_page; - struct page *end_page; - unsigned long block_pfn; - -@@ -267,20 +268,26 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source, - get_pageblock_migratetype(page) != MIGRATE_MOVABLE) - return false; - -+ /* Ensure the start of the pageblock or zone is online and valid */ -+ block_pfn = pageblock_start_pfn(pfn); -+ block_page = pfn_to_online_page(max(block_pfn, zone->zone_start_pfn)); -+ if (block_page) { -+ page = block_page; -+ pfn = block_pfn; -+ } -+ -+ /* Ensure the end of the pageblock or zone is online and valid */ -+ block_pfn += pageblock_nr_pages; -+ block_pfn = min(block_pfn, zone_end_pfn(zone) - 1); -+ end_page = pfn_to_online_page(block_pfn); -+ if (!end_page) -+ return false; -+ - /* - * Only clear the hint if a sample indicates there is either a - * free page or an LRU page in the block. One or other condition - * is necessary for the block to be a migration source/target. - */ -- block_pfn = pageblock_start_pfn(pfn); -- pfn = max(block_pfn, zone->zone_start_pfn); -- page = pfn_to_page(pfn); -- if (zone != page_zone(page)) -- return false; -- pfn = block_pfn + pageblock_nr_pages; -- pfn = min(pfn, zone_end_pfn(zone)); -- end_page = pfn_to_page(pfn); -- - do { - if (pfn_valid_within(pfn)) { - if (check_source && PageLRU(page)) { -@@ -309,7 +316,7 @@ __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source, - static void __reset_isolation_suitable(struct zone *zone) - { - unsigned long migrate_pfn = zone->zone_start_pfn; -- unsigned long free_pfn = zone_end_pfn(zone); -+ unsigned long free_pfn = zone_end_pfn(zone) - 1; - unsigned long reset_migrate = free_pfn; - unsigned long reset_free = migrate_pfn; - bool source_set = false; |