Commit Graph

61 Commits

Author SHA1 Message Date
Catalin Marinas 17bb9e0d90 kmemleak: Do not report new leaked objects if the scanning was stopped
If the scanning was stopped with a signal, it is possible that some
objects are left with a white colour (potential leaks) and reported. Add
a check to avoid reporting such objects.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-29 17:14:13 +01:00
Catalin Marinas acf4968ec9 kmemleak: Slightly change the policy on newly allocated objects
Newly allocated objects are more likely to be reported as false
positives. Kmemleak ignores the reporting of objects younger than 5
seconds. However, this age was calculated after the memory scanning
completed which usually takes longer than 5 seconds. This patch
make the minimum object age calculation in relation to the start of the
memory scanning.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-26 17:38:29 +01:00
Catalin Marinas 4698c1f2bb kmemleak: Do not trigger a scan when reading the debug/kmemleak file
Since there is a kernel thread for automatically scanning the memory, it
makes sense for the debug/kmemleak file to only show its findings. This
patch also adds support for "echo scan > debug/kmemleak" to trigger an
intermediate memory scan and eliminates the kmemleak_mutex (scan_mutex
covers all the cases now).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-26 17:38:27 +01:00
Catalin Marinas bab4a34afc kmemleak: Simplify the reports logged by the scanning thread
Because of false positives, the memory scanning thread may print too
much information. This patch changes the scanning thread to only print
the number of newly suspected leaks. Further information can be read
from the /sys/kernel/debug/kmemleak file.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-26 17:38:26 +01:00
Catalin Marinas e0a2a1601b kmemleak: Enable task stacks scanning by default
This is to reduce the number of false positives reported.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-26 17:38:25 +01:00
Catalin Marinas a9d9058aba kmemleak: Allow the early log buffer to be configurable.
(feature suggested by Sergey Senozhatsky)

Kmemleak needs to track all the memory allocations but some of these
happen before kmemleak is initialised. These are stored in an internal
buffer which may be exceeded in some kernel configurations. This patch
adds a configuration option with a default value of 400 and also removes
the stack dump when the early log buffer is exceeded.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@mail.by>
2009-06-25 10:16:13 +01:00
Joe Perches ae281064be kmemleak: use pr_fmt
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-23 14:40:26 +01:00
Catalin Marinas 2030117d27 kmemleak: Fix some typos in comments
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-17 18:29:04 +01:00
Catalin Marinas 000814f44e kmemleak: Rename kmemleak_panic to kmemleak_stop
This is to avoid the confusion created by the "panic" word.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-17 18:29:03 +01:00
Catalin Marinas 216c04b0d8 kmemleak: Only use GFP_KERNEL|GFP_ATOMIC for the internal allocations
Kmemleak allocates memory for pointer tracking and it tries to avoid
using GFP_ATOMIC if the caller doesn't require it. However other gfp
flags may be passed by the caller which aren't required by kmemleak.
This patch filters the gfp flags so that only GFP_KERNEL | GFP_ATOMIC
are used.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-17 18:29:02 +01:00
Catalin Marinas 3c7b4e6b8b kmemleak: Add the base support
This patch adds the base support for the kernel memory leak
detector. It traces the memory allocation/freeing in a way similar to
the Boehm's conservative garbage collector, the difference being that
the unreferenced objects are not freed but only shown in
/sys/kernel/debug/kmemleak. Enabling this feature introduces an
overhead to memory allocations.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2009-06-11 17:03:28 +01:00