* + slub-trace-free-objects-at-kern_info.patch added to -mm tree
@ 2017-01-13 23:00 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2017-01-13 23:00 UTC (permalink / raw)
To: daniel.thompson, cl, iamjoonsoo.kim, penberg, rientjes, mm-commits
The patch titled
Subject: mm/slub.c: trace free objects at KERN_INFO
has been added to the -mm tree. Its filename is
slub-trace-free-objects-at-kern_info.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/slub-trace-free-objects-at-kern_info.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/slub-trace-free-objects-at-kern_info.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Daniel Thompson <daniel.thompson@linaro.org>
Subject: mm/slub.c: trace free objects at KERN_INFO
Currently when trace is enabled (e.g. slub_debug=T,kmalloc-128 ) the
trace messages are mostly output at KERN_INFO. However the trace code
also calls print_section() to hexdump the head of a free object. This is
hard coded to use KERN_ERR, meaning the console is deluged with trace
messages even if we've asked for quiet.
Fix this the obvious way but adding a level parameter to print_section(),
allowing calls from the trace code to use the same trace level as other
trace messages.
Link: http://lkml.kernel.org/r/20170113154850.518-1-daniel.thompson@linaro.org
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/slub.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff -puN mm/slub.c~slub-trace-free-objects-at-kern_info mm/slub.c
--- a/mm/slub.c~slub-trace-free-objects-at-kern_info
+++ a/mm/slub.c
@@ -496,10 +496,11 @@ static inline int check_valid_pointer(st
return 1;
}
-static void print_section(char *text, u8 *addr, unsigned int length)
+static void print_section(char *level, char *text, u8 *addr,
+ unsigned int length)
{
metadata_access_enable();
- print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr,
+ print_hex_dump(level, text, DUMP_PREFIX_ADDRESS, 16, 1, addr,
length, 1);
metadata_access_disable();
}
@@ -636,14 +637,15 @@ static void print_trailer(struct kmem_ca
p, p - addr, get_freepointer(s, p));
if (s->flags & SLAB_RED_ZONE)
- print_section("Redzone ", p - s->red_left_pad, s->red_left_pad);
+ print_section(KERN_ERR, "Redzone ", p - s->red_left_pad,
+ s->red_left_pad);
else if (p > addr + 16)
- print_section("Bytes b4 ", p - 16, 16);
+ print_section(KERN_ERR, "Bytes b4 ", p - 16, 16);
- print_section("Object ", p, min_t(unsigned long, s->object_size,
- PAGE_SIZE));
+ print_section(KERN_ERR, "Object ", p,
+ min_t(unsigned long, s->object_size, PAGE_SIZE));
if (s->flags & SLAB_RED_ZONE)
- print_section("Redzone ", p + s->object_size,
+ print_section(KERN_ERR, "Redzone ", p + s->object_size,
s->inuse - s->object_size);
if (s->offset)
@@ -658,7 +660,8 @@ static void print_trailer(struct kmem_ca
if (off != size_from_object(s))
/* Beginning of the filler is the free pointer */
- print_section("Padding ", p + off, size_from_object(s) - off);
+ print_section(KERN_ERR, "Padding ", p + off,
+ size_from_object(s) - off);
dump_stack();
}
@@ -820,7 +823,7 @@ static int slab_pad_check(struct kmem_ca
end--;
slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
- print_section("Padding ", end - remainder, remainder);
+ print_section(KERN_ERR, "Padding ", end - remainder, remainder);
restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end);
return 0;
@@ -973,7 +976,7 @@ static void trace(struct kmem_cache *s,
page->freelist);
if (!alloc)
- print_section("Object ", (void *)object,
+ print_section(KERN_INFO, "Object ", (void *)object,
s->object_size);
dump_stack();
_
Patches currently in -mm which might be from daniel.thompson@linaro.org are
slub-trace-free-objects-at-kern_info.patch
tools-vm-add-missing-makefile-rules.patch
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2017-01-13 23:00 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-01-13 23:00 + slub-trace-free-objects-at-kern_info.patch added to -mm tree akpm
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.