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authorAkinobu Mita <akinobu.mita@gmail.com>2006-12-08 10:39:48 (GMT)
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 16:29:03 (GMT)
commit329409aeda064c4aff00c51f837fcd3bbdaeeba6 (patch)
treed22890da0d4f8d9f37bb1e9344cf41387a0a23f9 /Documentation/fault-injection
parentf4f154fd920b2178382a6a24a236348e4429ebc1 (diff)
[PATCH] fault injection: stacktrace filtering
This patch provides stacktrace filtering feature. The stacktrace filter allows failing only for the caller you are interested in. For example someone may want to inject kmalloc() failures into only e100 module. they want to inject not only direct kmalloc() call, but also indirect allocation, too. - e100_poll --> netif_receive_skb --> packet_rcv_spkt --> skb_clone --> kmem_cache_alloc This patch enables to detect function calls like this by stacktrace and inject failures. The script Documentaion/fault-injection/failmodule.sh helps it. The range of text section of loaded e100 is expected to be [/sys/module/e100/sections/.text, /sys/module/e100/sections/.exit.text) So failmodule.sh stores these values into /debug/failslab/address-start and /debug/failslab/address-end. The maximum stacktrace depth is specified by /debug/failslab/stacktrace-depth. Please see the example that demonstrates how to inject slab allocation failures only for a specific module in Documentation/fault-injection/fault-injection.txt [dwm@meer.net: reject failure if any caller lies within specified range] Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Don Mullis <dwm@meer.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/fault-injection')
-rw-r--r--Documentation/fault-injection/fault-injection.txt12
1 files changed, 8 insertions, 4 deletions
diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt
index cf075c2..6d6e5ac 100644
--- a/Documentation/fault-injection/fault-injection.txt
+++ b/Documentation/fault-injection/fault-injection.txt
@@ -73,13 +73,17 @@ configuration of fault-injection capabilities.
Any positive value limits failures to only processes indicated by
/proc/<pid>/make-it-fail==1.
-- /debug/*/address-start:
-- /debug/*/address-end:
+- /debug/*/require-start:
+- /debug/*/require-end:
+- /debug/*/reject-start:
+- /debug/*/reject-end:
specifies the range of virtual addresses tested during
stacktrace walking. Failure is injected only if some caller
- in the walked stacktrace lies within this range.
- Default is [0,ULONG_MAX) (whole of virtual address space).
+ in the walked stacktrace lies within the required range, and
+ none lies within the rejected range.
+ Default required range is [0,ULONG_MAX) (whole of virtual address space).
+ Default rejected range is [0,0).
- /debug/*/stacktrace-depth:

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