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[PATCH] fault-injection capability for kmalloc

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This patch provides fault-injection capability for kmalloc.

Boot option:

failslab=<interval>,<probability>,<space>,<times>

	<interval> -- specifies the interval of failures.

	<probability> -- specifies how often it should fail in percent.

	<space> -- specifies the size of free space where memory can be
		   allocated safely in bytes.

	<times> -- specifies how many times failures may happen at most.

Debugfs:

/debug/failslab/interval
/debug/failslab/probability
/debug/failslab/specifies
/debug/failslab/times
/debug/failslab/ignore-gfp-highmem
/debug/failslab/ignore-gfp-wait

Example:

	failslab=10,100,0,-1

slab allocation (kmalloc(), kmem_cache_alloc(),..) fails once per 10 times.

Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Akinobu Mita
2006-12-08 02:39:44 -08:00
committed by Linus Torvalds
parent 6ff1cb355e
commit 8a8b6502fb
3 changed files with 84 additions and 2 deletions
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2
Documentation/fault-injection/fault-injection.txt
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@@ -86,7 +86,6 @@ configuration of fault-injection capabilities.
specifies the maximum stacktrace depth walked during search
for a caller within [address-start,address-end).
- /debug/failslab/ignore-gfp-highmem:
- /debug/fail_page_alloc/ignore-gfp-highmem:
Format: { 0 | 1 }
@@ -167,7 +166,6 @@ echo 10 > /debug/$FAILNAME/probability
echo 100 > /debug/$FAILNAME/interval
echo -1 > /debug/$FAILNAME/times
echo 2 > /debug/$FAILNAME/verbose
echo 1 > /debug/$FAILNAME/ignore-gfp-highmem
echo 1 > /debug/$FAILNAME/ignore-gfp-wait
blacklist()