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splat linux:shrinker: Fix fail-safe 

Ensure the fail-safe is reset between successive tests.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Steven Johnson 2012-12-04 08:41:10 +08:00 committed by Brian Behlendorf
parent ca072ee70f
commit 794f145bf9
1 changed files with 21 additions and 4 deletions
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25
module/splat/splat-linux.c
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@ -101,6 +101,17 @@ static int
__splat_linux_shrinker_fn(struct shrinker *shrink, struct shrink_control *sc)
{
static int failsafe = 0;
static unsigned long last_splat_linux_shrinker_size = 0;
/*
* shrinker_size can only decrease or stay the same between callbacks
* in the same run, so Reset failsafe whenever shrinker increases
* as this indicates a new run.
*/
if (last_splat_linux_shrinker_size < splat_linux_shrinker_size)
failsafe = 0;
last_splat_linux_shrinker_size = splat_linux_shrinker_size;
if (sc->nr_to_scan) {
splat_linux_shrinker_size = splat_linux_shrinker_size -
@ -115,11 +126,17 @@ __splat_linux_shrinker_fn(struct shrinker *shrink, struct shrink_control *sc)
}
/* Far more calls than expected abort drop_slab as a failsafe */
if ((++failsafe % 1000) == 0) {
if (failsafe > 100) {
splat_vprint(splat_linux_shrinker_file, SPLAT_LINUX_TEST3_NAME,
"Far more calls than expected (%d), size now %lu\n",
failsafe, splat_linux_shrinker_size);
return -1;
} else {
/*
* We only increment failsafe if it doesn't trigger. This
* makes any failsafe failure persistent until the next test.
*/
failsafe++;
}
/* Shrinker has run, so signal back to test. */
@ -180,7 +197,7 @@ splat_linux_test3(struct file *file, void *arg)
*/
if (splat_linux_shrinker_size || splat_linux_shrinker_file) {
splat_vprint(file, SPLAT_LINUX_TEST3_NAME,
"Failed due to concurrent shrinker test, rc = %d\n", rc);
"Failed due to concurrent shrinker test, rc = %d\n", rc);
return (rc);
}
@ -202,7 +219,7 @@ splat_linux_test3(struct file *file, void *arg)
rc = wait_event_timeout(shrinker_wait, !splat_linux_shrinker_size, HZ);
if (!rc) {
splat_vprint(file, SPLAT_LINUX_TEST3_NAME,
"Failed cache shrinking timed out, size now %lu",
"Failed cache shrinking timed out, size now %lu",
splat_linux_shrinker_size);
rc = -ETIMEDOUT;
} else {
@ -211,7 +228,7 @@ splat_linux_test3(struct file *file, void *arg)
if (!rc && splat_linux_shrinker_size != 0) {
splat_vprint(file, SPLAT_LINUX_TEST3_NAME,
"Failed cache was not shrunk to 0, size now %lu",
"Failed cache was not shrunk to 0, size now %lu",
splat_linux_shrinker_size);
rc = -EDOM;
}