diff options
Diffstat (limited to 'Documentation/kmemleak.txt')
-rw-r--r-- | Documentation/kmemleak.txt | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/Documentation/kmemleak.txt b/Documentation/kmemleak.txt index 0112da3b9ab8..89068030b01b 100644 --- a/Documentation/kmemleak.txt +++ b/Documentation/kmemleak.txt | |||
@@ -16,13 +16,17 @@ Usage | |||
16 | ----- | 16 | ----- |
17 | 17 | ||
18 | CONFIG_DEBUG_KMEMLEAK in "Kernel hacking" has to be enabled. A kernel | 18 | CONFIG_DEBUG_KMEMLEAK in "Kernel hacking" has to be enabled. A kernel |
19 | thread scans the memory every 10 minutes (by default) and prints any new | 19 | thread scans the memory every 10 minutes (by default) and prints the |
20 | unreferenced objects found. To trigger an intermediate scan and display | 20 | number of new unreferenced objects found. To display the details of all |
21 | all the possible memory leaks: | 21 | the possible memory leaks: |
22 | 22 | ||
23 | # mount -t debugfs nodev /sys/kernel/debug/ | 23 | # mount -t debugfs nodev /sys/kernel/debug/ |
24 | # cat /sys/kernel/debug/kmemleak | 24 | # cat /sys/kernel/debug/kmemleak |
25 | 25 | ||
26 | To trigger an intermediate memory scan: | ||
27 | |||
28 | # echo scan > /sys/kernel/debug/kmemleak | ||
29 | |||
26 | Note that the orphan objects are listed in the order they were allocated | 30 | Note that the orphan objects are listed in the order they were allocated |
27 | and one object at the beginning of the list may cause other subsequent | 31 | and one object at the beginning of the list may cause other subsequent |
28 | objects to be reported as orphan. | 32 | objects to be reported as orphan. |
@@ -31,16 +35,21 @@ Memory scanning parameters can be modified at run-time by writing to the | |||
31 | /sys/kernel/debug/kmemleak file. The following parameters are supported: | 35 | /sys/kernel/debug/kmemleak file. The following parameters are supported: |
32 | 36 | ||
33 | off - disable kmemleak (irreversible) | 37 | off - disable kmemleak (irreversible) |
34 | stack=on - enable the task stacks scanning | 38 | stack=on - enable the task stacks scanning (default) |
35 | stack=off - disable the tasks stacks scanning | 39 | stack=off - disable the tasks stacks scanning |
36 | scan=on - start the automatic memory scanning thread | 40 | scan=on - start the automatic memory scanning thread (default) |
37 | scan=off - stop the automatic memory scanning thread | 41 | scan=off - stop the automatic memory scanning thread |
38 | scan=<secs> - set the automatic memory scanning period in seconds (0 | 42 | scan=<secs> - set the automatic memory scanning period in seconds |
39 | to disable it) | 43 | (default 600, 0 to stop the automatic scanning) |
44 | scan - trigger a memory scan | ||
40 | 45 | ||
41 | Kmemleak can also be disabled at boot-time by passing "kmemleak=off" on | 46 | Kmemleak can also be disabled at boot-time by passing "kmemleak=off" on |
42 | the kernel command line. | 47 | the kernel command line. |
43 | 48 | ||
49 | Memory may be allocated or freed before kmemleak is initialised and | ||
50 | these actions are stored in an early log buffer. The size of this buffer | ||
51 | is configured via the CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE option. | ||
52 | |||
44 | Basic Algorithm | 53 | Basic Algorithm |
45 | --------------- | 54 | --------------- |
46 | 55 | ||