From: Vlastimil Babka <vbabka@suse.cz>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Minchan Kim <minchan@kernel.org>,
Sasha Levin <sasha.levin@oracle.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH v2 1/9] mm, debug: fix wrongly filtered flags in dump_vma()
Date: Tue, 24 Nov 2015 13:36:13 +0100 [thread overview]
Message-ID: <1448368581-6923-2-git-send-email-vbabka@suse.cz> (raw)
In-Reply-To: <1448368581-6923-1-git-send-email-vbabka@suse.cz>
The dump_vma() function uses dump_flags() for printing the flags as symbolic
names. That function however does a page-flags specific filtering of bits
higher than NR_PAGEFLAGS in order to remove the zone id part. For dump_vma()
this results in removing several VM_* flags from the symbolic translation.
Fix this by refactoring dump_flags() to dump_flag_names(), which only prints
the symbolic names in parentheses. Printing the raw flag value with a prefix,
and any filtering is left to the caller. In addition to fixing the bug, this
allows better flexibility, which will be useful to print gfp_flags by a later
patch.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
mm/debug.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/mm/debug.c b/mm/debug.c
index 8362765..d9718fc 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -46,17 +46,14 @@ static const struct trace_print_flags pageflag_names[] = {
#endif
};
-static void dump_flags(unsigned long flags,
+static void dump_flag_names(unsigned long flags,
const struct trace_print_flags *names, int count)
{
const char *delim = "";
unsigned long mask;
int i;
- pr_emerg("flags: %#lx(", flags);
-
- /* remove zone id */
- flags &= (1UL << NR_PAGEFLAGS) - 1;
+ pr_cont("(");
for (i = 0; i < count && flags; i++) {
@@ -79,6 +76,8 @@ static void dump_flags(unsigned long flags,
void dump_page_badflags(struct page *page, const char *reason,
unsigned long badflags)
{
+ unsigned long printflags = page->flags;
+
pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
page, atomic_read(&page->_count), page_mapcount(page),
page->mapping, page->index);
@@ -86,13 +85,19 @@ void dump_page_badflags(struct page *page, const char *reason,
pr_cont(" compound_mapcount: %d", compound_mapcount(page));
pr_cont("\n");
BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
- dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
+
+ pr_emerg("flags: %#lx", printflags);
+ /* remove zone id */
+ printflags &= (1UL << NR_PAGEFLAGS) - 1;
+ dump_flag_names(printflags, pageflag_names, ARRAY_SIZE(pageflag_names));
+
if (reason)
pr_alert("page dumped because: %s\n", reason);
if (page->flags & badflags) {
- pr_alert("bad because of flags:\n");
- dump_flags(page->flags & badflags,
- pageflag_names, ARRAY_SIZE(pageflag_names));
+ printflags = page->flags & badflags;
+ pr_alert("bad because of flags: %#lx:", printflags);
+ dump_flag_names(printflags, pageflag_names,
+ ARRAY_SIZE(pageflag_names));
}
#ifdef CONFIG_MEMCG
if (page->mem_cgroup)
@@ -162,7 +167,9 @@ void dump_vma(const struct vm_area_struct *vma)
(unsigned long)pgprot_val(vma->vm_page_prot),
vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
vma->vm_file, vma->vm_private_data);
- dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
+ pr_emerg("flags: %#lx", vma->vm_flags);
+ dump_flag_names(vma->vm_flags, vmaflags_names,
+ ARRAY_SIZE(vmaflags_names));
}
EXPORT_SYMBOL(dump_vma);
@@ -233,8 +240,9 @@ void dump_mm(const struct mm_struct *mm)
"" /* This is here to not have a comma! */
);
- dump_flags(mm->def_flags, vmaflags_names,
- ARRAY_SIZE(vmaflags_names));
+ pr_emerg("def_flags: %#lx(", mm->def_flags);
+ dump_flag_names(mm->def_flags, vmaflags_names,
+ ARRAY_SIZE(vmaflags_names));
}
#endif /* CONFIG_DEBUG_VM */
--
2.6.3
next prev parent reply other threads:[~2015-11-24 12:36 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 12:36 [PATCH v2 0/9] page_owner improvements for debugging Vlastimil Babka
2015-11-24 12:36 ` Vlastimil Babka [this message]
2015-11-27 9:52 ` [PATCH v2 1/9] mm, debug: fix wrongly filtered flags in dump_vma() Vlastimil Babka
2015-11-24 12:36 ` [PATCH v2 2/9] mm, page_owner: print symbolic migratetype of both page and pageblock Vlastimil Babka
2015-11-25 8:11 ` Joonsoo Kim
2015-11-24 12:36 ` [PATCH v2 3/9] mm, page_owner: convert page_owner_inited to static key Vlastimil Babka
2015-11-25 14:52 ` Michal Hocko
2015-11-25 15:08 ` Vlastimil Babka
2015-11-25 15:25 ` Peter Zijlstra
2015-11-25 15:46 ` Michal Hocko
2015-11-24 12:36 ` [PATCH v2 4/9] mm, page_owner: copy page owner info during migration Vlastimil Babka
2015-11-24 12:36 ` [PATCH v2 5/9] mm, page_owner: track and print last migrate reason Vlastimil Babka
2015-11-25 8:13 ` Joonsoo Kim
2015-11-26 10:39 ` Vlastimil Babka
2015-11-24 12:36 ` [PATCH v2 6/9] mm, debug: introduce dump_gfpflag_names() for symbolic printing of gfp_flags Vlastimil Babka
2015-11-25 8:16 ` Joonsoo Kim
2015-11-25 10:28 ` Vlastimil Babka
2015-11-27 3:40 ` yalin wang
2015-11-24 12:36 ` [PATCH v2 7/9] mm, page_owner: dump page owner info from dump_page() Vlastimil Babka
2015-11-25 14:58 ` Michal Hocko
2015-11-26 10:43 ` Vlastimil Babka
2015-11-24 12:36 ` [PATCH v2 8/9] mm, page_alloc: print symbolic gfp_flags on allocation failure Vlastimil Babka
2015-11-25 14:33 ` Michal Hocko
2015-11-24 12:36 ` [PATCH v2 9/9] mm, oom: print symbolic gfp_flags in oom warning Vlastimil Babka
2015-11-25 14:31 ` Michal Hocko
2016-01-07 21:29 ` David Rientjes
2016-01-08 11:34 ` Vlastimil Babka
2015-11-25 14:30 ` [PATCH v2 0/9] page_owner improvements for debugging Michal Hocko
2015-11-30 16:10 ` [PATCH 1/2] mm, printk: introduce new format string for flags Vlastimil Babka
2015-11-30 16:10 ` [PATCH 2/2] mm, page_owner: provide symbolic page flags and gfp_flags Vlastimil Babka
2015-12-02 11:01 ` [PATCH 1/2] mm, printk: introduce new format string for flags Rasmus Villemoes
2015-12-02 20:34 ` Vlastimil Babka
2015-12-03 12:37 ` Rasmus Villemoes
2015-12-03 13:46 ` Vlastimil Babka
2015-12-04 15:16 ` [PATCH v2 1/3] " Vlastimil Babka
2015-12-04 15:16 ` [PATCH v2 2/3] mm, page_owner: provide symbolic page flags and gfp_flags Vlastimil Babka
2015-12-04 15:16 ` [PATCH v2 3/3] mm, debug: move bad flags printing to bad_page() Vlastimil Babka
2015-12-05 20:00 ` [PATCH v2 1/3] mm, printk: introduce new format string for flags Rasmus Villemoes
2015-12-09 11:29 ` Arnd Bergmann
2015-12-09 20:48 ` Vlastimil Babka
2015-12-10 12:26 ` James Hogan
2015-12-10 2:59 ` Joonsoo Kim
2015-12-10 4:04 ` Steven Rostedt
2015-12-10 4:12 ` Joonsoo Kim
2015-12-10 8:41 ` Rasmus Villemoes
2015-12-10 10:03 ` Vlastimil Babka
2015-12-14 3:03 ` Joonsoo Kim
2015-12-10 3:51 ` Steven Rostedt
2015-12-10 9:51 ` Vlastimil Babka
2015-12-02 17:40 ` [PATCH 1/2] " yalin wang
2015-12-02 21:04 ` Vlastimil Babka
2015-12-03 0:11 ` yalin wang
2015-12-03 8:03 ` Rasmus Villemoes
2015-12-03 18:38 ` yalin wang
2015-12-04 1:04 ` yalin wang
2015-12-04 14:15 ` Vlastimil Babka
2015-12-10 4:03 ` Steven Rostedt
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