The patch titled
Subject: mm, page_owner: provide symbolic page flags and gfp_flags
has been added to the -mm tree. Its filename is
mm-page_owner-provide-symbolic-page-flags-and-gfp_flags.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_owner-provide-symbolic-page-flags-and-gfp_flags.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_owner-provide-symbolic-page-flags-and-gfp_flags.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, page_owner: provide symbolic page flags and gfp_flags
With the new format strings for flags, we can now provide symbolic page
and gfp flags in the /sys/kernel/debug/page_owner file. This replaces the
positional printing of page flags as single letters, which might have
looked nicer, but was limited to a subset of flags, and required the user
to remember the letters.
Example of the adjusted format:
Page allocated via order 0, mask 0x24213ca(GFP_HIGHUSER_MOVABLE|GFP_COLD|GFP_NOWARN|GFP_NORETRY)
PFN 674308 type Movable Block 1317 type Movable Flags 0x1fffff80010068(uptodate|lru|active|mappedtodisk)
[<ffffffff81164e9a>] __alloc_pages_nodemask+0x15a/0xa30
[<ffffffff811ab938>] alloc_pages_current+0x88/0x120
[<ffffffff8115bc46>] __page_cache_alloc+0xe6/0x120
[<ffffffff81168b9b>] __do_page_cache_readahead+0xdb/0x200
[<ffffffff81168df5>] ondemand_readahead+0x135/0x260
[<ffffffff81168f8c>] page_cache_async_readahead+0x6c/0x70
[<ffffffff8115d5f8>] generic_file_read_iter+0x378/0x590
[<ffffffff811d12a7>] __vfs_read+0xa7/0xd0
Page has been migrated, last migrate reason: compaction
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 20 +++++---------------
1 file changed, 5 insertions(+), 15 deletions(-)
diff -puN mm/page_owner.c~mm-page_owner-provide-symbolic-page-flags-and-gfp_flags mm/page_owner.c
--- a/mm/page_owner.c~mm-page_owner-provide-symbolic-page-flags-and-gfp_flags
+++ a/mm/page_owner.c
@@ -135,8 +135,9 @@ print_page_owner(char __user *buf, size_
return -ENOMEM;
ret = snprintf(kbuf, count,
- "Page allocated via order %u, mask 0x%x\n",
- page_ext->order, page_ext->gfp_mask);
+ "Page allocated via order %u, mask %#x(%pgg)\n",
+ page_ext->order, page_ext->gfp_mask,
+ &page_ext->gfp_mask);
if (ret >= count)
goto err;
@@ -145,23 +146,12 @@ print_page_owner(char __user *buf, size_
pageblock_mt = get_pfnblock_migratetype(page, pfn);
page_mt = gfpflags_to_migratetype(page_ext->gfp_mask);
ret += snprintf(kbuf + ret, count - ret,
- "PFN %lu type %s Block %lu type %s Flags %s%s%s%s%s%s%s%s%s%s%s%s\n",
+ "PFN %lu type %s Block %lu type %s Flags %#lx(%pgp)\n",
pfn,
migratetype_names[page_mt],
pfn >> pageblock_order,
migratetype_names[pageblock_mt],
- PageLocked(page) ? "K" : " ",
- PageError(page) ? "E" : " ",
- PageReferenced(page) ? "R" : " ",
- PageUptodate(page) ? "U" : " ",
- PageDirty(page) ? "D" : " ",
- PageLRU(page) ? "L" : " ",
- PageActive(page) ? "A" : " ",
- PageSlab(page) ? "S" : " ",
- PageWriteback(page) ? "W" : " ",
- PageCompound(page) ? "C" : " ",
- PageSwapCache(page) ? "B" : " ",
- PageMappedToDisk(page) ? "M" : " ");
+ page->flags, &page->flags);
if (ret >= count)
goto err;
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-fix-swapped-movable-and-reclaimable-in-proc-pagetypeinfo.patch
mm-documentation-clarify-proc-pid-status-vmswap-limitations-for-shmem.patch
mm-proc-account-for-shmem-swap-in-proc-pid-smaps.patch
mm-proc-reduce-cost-of-proc-pid-smaps-for-shmem-mappings.patch
mm-proc-reduce-cost-of-proc-pid-smaps-for-unpopulated-shmem-mappings.patch
mm-debug-fix-wrongly-filtered-flags-in-dump_vma.patch
mm-debug-fix-wrongly-filtered-flags-in-dump_vma-fix.patch
mm-page_owner-print-symbolic-migratetype-of-both-page-and-pageblock.patch
mm-page_owner-convert-page_owner_inited-to-static-key.patch
mm-page_owner-copy-page-owner-info-during-migration.patch
mm-page_owner-track-and-print-last-migrate-reason.patch
mm-page_owner-track-and-print-last-migrate-reason-fix.patch
mm-debug-introduce-dump_gfpflag_names-for-symbolic-printing-of-gfp_flags.patch
mm-page_owner-dump-page-owner-info-from-dump_page.patch
mm-page_owner-dump-page-owner-info-from-dump_page-fix.patch
mm-page_alloc-print-symbolic-gfp_flags-on-allocation-failure.patch
mm-oom-print-symbolic-gfp_flags-in-oom-warning.patch
mm-printk-introduce-new-format-string-for-flags.patch
mm-page_owner-provide-symbolic-page-flags-and-gfp_flags.patch
mm-debug-move-bad-flags-printing-to-bad_page.patch
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