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2009-09-08kmemleak: add clear command supportLuis R. Rodriguez1-0/+30
In an ideal world your kmemleak output will be small, when its not (usually during initial bootup) you can use the clear command to ingore previously reported and unreferenced kmemleak objects. We do this by painting all currently reported unreferenced objects grey. We paint them grey instead of black to allow future scans on the same objects as such objects could still potentially reference newly allocated objects in the future. To test a critical section on demand with a clean /sys/kernel/debug/kmemleak you can do: echo clear > /sys/kernel/debug/kmemleak test your kernel or modules echo scan > /sys/kernel/debug/kmemleak Then as usual to get your report with: cat /sys/kernel/debug/kmemleak Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-08-27kmemleak: Dump object information on requestCatalin Marinas1-0/+1
By writing dump=<addr> to the kmemleak file, kmemleak will look up an object with that address and dump the information it has about it to syslog. This is useful in debugging memory leaks. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-26kmemleak: Do not trigger a scan when reading the debug/kmemleak fileCatalin Marinas1-2/+7
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>
2009-06-26kmemleak: Simplify the reports logged by the scanning threadCatalin Marinas1-3/+3
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>
2009-06-26kmemleak: Enable task stacks scanning by defaultCatalin Marinas1-4/+4
This is to reduce the number of false positives reported. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-06-25kmemleak: Allow the early log buffer to be configurable.Catalin Marinas1-0/+4
(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>
2009-06-11kmemleak: Add documentation on the memory leak detectorCatalin Marinas1-0/+142
This patch adds the Documentation/kmemleak.txt file with some information about how kmemleak works. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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