akpm: Alex's ancient page-owner tracking code, resurrected yet
again. Someone(tm) should mainline this. Please see Ingo's
thoughts at https://lkml.org/lkml/2009/4/1/137.
PAGE_OWNER tracks free pages by setting page->order to -1. However, it is
set during __free_pages() which is not the only free path as
__pagevec_free() and free_compound_page() do not go through __free_pages().
This leads to a situation where free pages are visible in page_owner
which is confusing and might be interpreted as a memory leak.
This patch sets page->owner when PageBuddy is set. It also prints a
warning to the kernel log if a free page is found that does not appear free
to PAGE_OWNER. This should be considered a fix to
page-owner-tracking-leak-detector.patch.
This only applies to -mm as PAGE_OWNER is not in mainline.
[mel@csn.ul.ie: print out PAGE_OWNER statistics in relation to fragmentation avoidance]
[mel.ul.ie: allow PAGE_OWNER to be set on any architecture]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Laura Abbott <lauraa@codeaurora.org>
From: Dave Hansen <dave@linux.vnet.ibm.com>
Subject: debugging-keep-track-of-page-owners-fix
Updated 12/4/2012 - should apply to 3.7 kernels. I did a quick
sniff-test to make sure that this boots and produces some sane
output, but it's not been exhaustively tested.
* Moved file over to debugfs (no reason to keep polluting /proc)
* Now using generic stack tracking infrastructure
* Added check for MIGRATE_CMA pages to explicitly count them
as movable.
The new snprint_stack_trace() probably belongs in its own patch
if this were to get merged, but it won't kill anyone as it stands.
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Laura Abbott <lauraa@codeaurora.org>
From: Minchan Kim <minchan@kernel.org>
Subject: Fix wrong EOF compare
The C standards allows the character type char to be singed or unsinged,
depending on the platform and compiler. Most of systems uses signed char,
but those based on PowerPC and ARM processors typically use unsigned char.
This can lead to unexpected results when the variable is used to compare
with EOF(-1). It happens my ARM system and this patch fixes it.
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: debugging-keep-track-of-page-owners-fix-2-fix
Reduce scope of `val', fix coding style
Cc: Minchan Kim <minchan@kernel.org>
From: Minchan Kim <minchan@kernel.org>
Subject: Enhance read_block of page_owner.c
The read_block reads char one by one until meeting two newline.
It's not good for the performance and current code isn't good shape
for readability.
This patch enhances speed and clean up.
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: debugging-keep-track-of-page-owner-now-depends-on-stacktrace_support-fix
stomp sparse gfp_t warnings
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
From: Dave Hansen <dave@linux.vnet.ibm.com>
Subject: PAGE_OWNER now depends on STACKTRACE_SUPPORT
One of the enhancements I made to the PAGE_OWNER code was to make
it use the generic stack trace support. However, there are some
architectures that do not support it, like m68k. So, make
PAGE_OWNER also depend on having STACKTRACE_SUPPORT.
This isn't ideal since it restricts the number of places
PAGE_OWNER runs now, but it at least hits all the major
architectures.
tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 83b324c5ff5cca85bbeb2ba913d465f108afe472
commit: 2a561c9d47c295ed91984c2b916a4dd450ee0279 [484/499] debugging-keep-track-of-page-owners-fix
config: make ARCH=m68k allmodconfig
All warnings:
warning: (PAGE_OWNER && STACK_TRACER && BLK_DEV_IO_TRACE && KMEMCHECK) selects STACKTRACE which has unmet direct dependencies (STACKTRACE_SUPPORT)
Change-Id: I8d9370733ead1c6a45bb034acc7aaf96e0901fea
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Git-commit: c6ca98b4acab6ae45cf0f9d93de9c717186e62cb
Git-repo: http://git.cmpxchg.org/cgit/linux-mmotm.git/
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
The changed files were only including linux/module.h for the
EXPORT_SYMBOL infrastructure, and nothing else. Revector them
onto the isolated export header for faster compile times.
Nothing to see here but a whole lot of instances of:
-#include <linux/module.h>
+#include <linux/export.h>
This commit is only changing the kernel dir; next targets
will probably be mm, fs, the arch dirs, etc.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Add weak symbol of save_stack_trace_regs() as same as
save_stack_trace_tsk() since that is not implemented
except x86 yet.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: yrl.pp-manager.tt@hitachi.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@gmail.com>
Link: http://lkml.kernel.org/r/20110608070927.17777.37895.stgit@fedora15
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Impact: build fix
Some architectures have not implemented save_stack_trace_tsk() yet:
fs/built-in.o: In function `proc_pid_stack':
base.c:(.text+0x3f140): undefined reference to `save_stack_trace_tsk'
So warn about that if the facility is used.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
- shorter code and better atomicity with regards to printk().
(It's been tested with the backtrace self-test code on i386 and x86_64.)
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This patch makes the stacktrace printout code \warn when the entries
pointer is unset rather than crashing when trying to access it in an
attempt to make it a bit more robust.
I was saving a stacktrace into an skb and forgot to copy it across skb
copies... I have since fixed the code, but it would have been easier
had the kernel not crashed in an interrupt.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Framework to generate and save stacktraces quickly, without printing anything
to the console.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Alexander Nyberg
Paul Gortmaker
Masami Hiramatsu
Ingo Molnar
Vegard Nossum
Johannes Berg