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debugfs: Fix terminology inconsistency of dir name to mount debugfs filesystem.

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Many developers use "/debug/" or "/debugfs/" or "/sys/kernel/debug/"
directory name to mount debugfs filesystem for ftrace according to
./Documentation/tracers/ftrace.txt file.

And, three directory names(ex:/debug/, /debugfs/, /sys/kernel/debug/) is
existed in kernel source like ftrace, DRM, Wireless, Documentation,
Network[sky2]files to mount debugfs filesystem.

debugfs means debug filesystem for debugging easy to use by greg kroah
hartman. "/sys/kernel/debug/" name is suitable as directory name
of debugfs filesystem.
- debugfs related reference: http://lwn.net/Articles/334546/

Fix inconsistency of directory name to mount debugfs filesystem.

* From Steven Rostedt
  - find_debugfs() and tracing_files() in this patch.

Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Acked-by     : Inaky Perez-Gonzalez <inaky@linux.intel.com>
Reviewed-by  : Steven Rostedt <rostedt@goodmis.org>
Reviewed-by  : James Smart <james.smart@emulex.com>
CC: Jiri Kosina <trivial@kernel.org>
CC: David Airlie <airlied@linux.ie>
CC: Peter Osterlund <petero2@telia.com>
CC: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
CC: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
CC: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
GeunSik Lim
2009-06-02 15:01:37 +09:00
committed by Greg Kroah-Hartman
parent 1b713e0050
commit 156f5a7801
20 changed files with 238 additions and 191 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
Documentation/fault-injection/fault-injection.txt
View File

@@ -29,16 +29,16 @@ o debugfs entries
fault-inject-debugfs kernel module provides some debugfs entries for runtime
configuration of fault-injection capabilities.
- /debug/fail*/probability:
- /sys/kernel/debug/fail*/probability:
likelihood of failure injection, in percent.
Format: <percent>
Note that one-failure-per-hundred is a very high error rate
for some testcases. Consider setting probability=100 and configure
/debug/fail*/interval for such testcases.
/sys/kernel/debug/fail*/interval for such testcases.
- /debug/fail*/interval:
- /sys/kernel/debug/fail*/interval:
specifies the interval between failures, for calls to
should_fail() that pass all the other tests.
@@ -46,18 +46,18 @@ configuration of fault-injection capabilities.
Note that if you enable this, by setting interval>1, you will
probably want to set probability=100.
- /debug/fail*/times:
- /sys/kernel/debug/fail*/times:
specifies how many times failures may happen at most.
A value of -1 means "no limit".
- /debug/fail*/space:
- /sys/kernel/debug/fail*/space:
specifies an initial resource "budget", decremented by "size"
on each call to should_fail(,size). Failure injection is
suppressed until "space" reaches zero.
- /debug/fail*/verbose
- /sys/kernel/debug/fail*/verbose
Format: { 0 | 1 | 2 }
specifies the verbosity of the messages when failure is
@@ -65,17 +65,17 @@ configuration of fault-injection capabilities.
log line per failure; '2' will print a call trace too -- useful
to debug the problems revealed by fault injection.
- /debug/fail*/task-filter:
- /sys/kernel/debug/fail*/task-filter:
Format: { 'Y' | 'N' }
A value of 'N' disables filtering by process (default).
Any positive value limits failures to only processes indicated by
/proc/<pid>/make-it-fail==1.
- /debug/fail*/require-start:
- /debug/fail*/require-end:
- /debug/fail*/reject-start:
- /debug/fail*/reject-end:
- /sys/kernel/debug/fail*/require-start:
- /sys/kernel/debug/fail*/require-end:
- /sys/kernel/debug/fail*/reject-start:
- /sys/kernel/debug/fail*/reject-end:
specifies the range of virtual addresses tested during
stacktrace walking. Failure is injected only if some caller
@@ -84,26 +84,26 @@ configuration of fault-injection capabilities.
Default required range is [0,ULONG_MAX) (whole of virtual address space).
Default rejected range is [0,0).
- /debug/fail*/stacktrace-depth:
- /sys/kernel/debug/fail*/stacktrace-depth:
specifies the maximum stacktrace depth walked during search
for a caller within [require-start,require-end) OR
[reject-start,reject-end).
- /debug/fail_page_alloc/ignore-gfp-highmem:
- /sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem:
Format: { 'Y' | 'N' }
default is 'N', setting it to 'Y' won't inject failures into
highmem/user allocations.
- /debug/failslab/ignore-gfp-wait:
- /debug/fail_page_alloc/ignore-gfp-wait:
- /sys/kernel/debug/failslab/ignore-gfp-wait:
- /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait:
Format: { 'Y' | 'N' }
default is 'N', setting it to 'Y' will inject failures
only into non-sleep allocations (GFP_ATOMIC allocations).
- /debug/fail_page_alloc/min-order:
- /sys/kernel/debug/fail_page_alloc/min-order:
specifies the minimum page allocation order to be injected
failures.
@@ -166,13 +166,13 @@ o Inject slab allocation failures into module init/exit code
#!/bin/bash
FAILTYPE=failslab
echo Y > /debug/$FAILTYPE/task-filter
echo 10 > /debug/$FAILTYPE/probability
echo 100 > /debug/$FAILTYPE/interval
echo -1 > /debug/$FAILTYPE/times
echo 0 > /debug/$FAILTYPE/space
echo 2 > /debug/$FAILTYPE/verbose
echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
echo Y > /sys/kernel/debug/$FAILTYPE/task-filter
echo 10 > /sys/kernel/debug/$FAILTYPE/probability
echo 100 > /sys/kernel/debug/$FAILTYPE/interval
echo -1 > /sys/kernel/debug/$FAILTYPE/times
echo 0 > /sys/kernel/debug/$FAILTYPE/space
echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
faulty_system()
{
@@ -217,20 +217,20 @@ then
exit 1
fi
cat /sys/module/$module/sections/.text > /debug/$FAILTYPE/require-start
cat /sys/module/$module/sections/.data > /debug/$FAILTYPE/require-end
cat /sys/module/$module/sections/.text > /sys/kernel/debug/$FAILTYPE/require-start
cat /sys/module/$module/sections/.data > /sys/kernel/debug/$FAILTYPE/require-end
echo N > /debug/$FAILTYPE/task-filter
echo 10 > /debug/$FAILTYPE/probability
echo 100 > /debug/$FAILTYPE/interval
echo -1 > /debug/$FAILTYPE/times
echo 0 > /debug/$FAILTYPE/space
echo 2 > /debug/$FAILTYPE/verbose
echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
echo 1 > /debug/$FAILTYPE/ignore-gfp-highmem
echo 10 > /debug/$FAILTYPE/stacktrace-depth
echo N > /sys/kernel/debug/$FAILTYPE/task-filter
echo 10 > /sys/kernel/debug/$FAILTYPE/probability
echo 100 > /sys/kernel/debug/$FAILTYPE/interval
echo -1 > /sys/kernel/debug/$FAILTYPE/times
echo 0 > /sys/kernel/debug/$FAILTYPE/space
echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem
echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth
trap "echo 0 > /debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
echo "Injecting errors into the module $module... (interrupt to stop)"
sleep 1000000