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docs: fault-injection: fix defaults 

ignore-gfp-wait and ignore-gfp-highmem defaults are actually true (Y) in
both failslab and fail_page_alloc, not false as the docs suggest. See
page_alloc.c:3762 and failslab.c:13

At the same time use 'Y' instead of '1' in the example scripts just for
consistency. (though 1 would work)

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Dylan Yudaken 2022-04-05 02:54:14 -07:00 committed by Jonathan Corbet
parent e01159c713
commit bad3fbb256
1 changed files with 7 additions and 7 deletions
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14
Documentation/fault-injection/fault-injection.rst
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@ -132,16 +132,16 @@ configuration of fault-injection capabilities.
Format: { 'Y' | 'N' } Format: { 'Y' | 'N' }
default is 'N', setting it to 'Y' won't inject failures into default is 'Y', setting it to 'N' will also inject failures into
highmem/user allocations. highmem/user allocations (__GFP_HIGHMEM allocations).
- /sys/kernel/debug/failslab/ignore-gfp-wait: - /sys/kernel/debug/failslab/ignore-gfp-wait:
- /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait: - /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait:
Format: { 'Y' | 'N' } Format: { 'Y' | 'N' }
default is 'N', setting it to 'Y' will inject failures default is 'Y', setting it to 'N' will also inject failures
only into non-sleep allocations (GFP_ATOMIC allocations). into allocations that can sleep (__GFP_DIRECT_RECLAIM allocations).
- /sys/kernel/debug/fail_page_alloc/min-order: - /sys/kernel/debug/fail_page_alloc/min-order:
@ -280,7 +280,7 @@ Application Examples
printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times
echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 0 > /sys/kernel/debug/$FAILTYPE/space
echo 2 > /sys/kernel/debug/$FAILTYPE/verbose echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
faulty_system() faulty_system()
{ {
@ -334,8 +334,8 @@ Application Examples
printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times
echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 0 > /sys/kernel/debug/$FAILTYPE/space
echo 2 > /sys/kernel/debug/$FAILTYPE/verbose echo 2 > /sys/kernel/debug/$FAILTYPE/verbose
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait
echo 1 > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-highmem
echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth echo 10 > /sys/kernel/debug/$FAILTYPE/stacktrace-depth
trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT trap "echo 0 > /sys/kernel/debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT