[alternative-merged] mm-fix-bogus-vm_bug_on_page-in-isolate_lru_page.patch removed from -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The patch titled
     Subject: mm: fix bogus VM_BUG_ON_PAGE() in isolate_lru_page()
has been removed from the -mm tree.  Its filename was
     mm-fix-bogus-vm_bug_on_page-in-isolate_lru_page.patch

This patch was dropped because an alternative patch was merged

------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: fix bogus VM_BUG_ON_PAGE() in isolate_lru_page()

We don't care if there's a tail pages which is not on LRU. We are not
going to isolate them anyway.

Testcase:

	#include <fcntl.h>
	#include <unistd.h>
	#include <stdio.h>
	#include <sys/mman.h>
	#include <numaif.h>

	#define SIZE 0x2000

	int foo;

	int main()
	{
		int fd;
		char *p;
		unsigned long mask = 2;

		fd = open("/dev/sg0", O_RDWR);
		p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
		/* Faultin pages */
		foo = p[0] + p[0x1000];
		mbind(p, SIZE, MPOL_BIND, &mask, 4, MPOL_MF_MOVE | MPOL_MF_STRICT);
		return 0;
	}

MPOL_MF_STRICT makes queue_pages_test_walk() ignore !vma_megratable()
and we try to queue such pages for migration. It's good question why we
ignore !vma_megratable() for MPOL_MF_STRICT, but it's subject for a
separate patch.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Fixes: bb5b8589767a ("mm: make sure isolate_lru_page() is never called for tail page")
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/vmscan.c~mm-fix-bogus-vm_bug_on_page-in-isolate_lru_page mm/vmscan.c
--- a/mm/vmscan.c~mm-fix-bogus-vm_bug_on_page-in-isolate_lru_page
+++ a/mm/vmscan.c
@@ -1443,7 +1443,7 @@ int isolate_lru_page(struct page *page)
 	int ret = -EBUSY;
 
 	VM_BUG_ON_PAGE(!page_count(page), page);
-	VM_BUG_ON_PAGE(PageTail(page), page);
+	VM_BUG_ON_PAGE(PageLRU(page) && PageTail(page), page);
 
 	if (PageLRU(page)) {
 		struct zone *zone = page_zone(page);
_

Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are

thp-make-split_queue-per-node.patch
thp-change-deferred_split_count-to-return-number-of-thp-in-queue.patch
thp-change-deferred_split_count-to-return-number-of-thp-in-queue-fix.patch
thp-limit-number-of-object-to-scan-on-deferred_split_scan.patch
drivers-scsi-sgc-mark-vma-as-vm_io-to-prevent-migration.patch
mempolicy-do-not-try-to-queue-pages-from-vma_migratable.patch
ipc-shm-handle-removed-segments-gracefully-in-shm_mmap.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-2.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-3.patch

--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies FAQ]     [Kernel Archive]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [Bugtraq]     [Photo]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]

  Powered by Linux