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 <vba...@suse.cz>
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Cc: Minchan Kim <minc...@kernel.org>
Cc: Sasha Levin <sasha.le...@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Michal Hocko <mho...@suse.cz>
---
mm/page_owner.c | 20 +++++---------------
1 file changed, 5 insertions(+), 15 deletions(-)
diff --git a/mm/page_owner.c b/mm/page_owner.c
index 313251f36d86..011377548b4f 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -135,8 +135,9 @@ print_page_owner(char __user *buf, size_t count, unsigned
long pfn,
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_t count, unsigned
long pfn,
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;
--
2.6.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
