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Message-Id: <1575374868-32601-5-git-send-email-alan.maguire@oracle.com>
Date: Tue, 3 Dec 2019 12:07:46 +0000
From: Alan Maguire <alan.maguire@...cle.com>
To: brendanhiggins@...gle.com, linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
keescook@...omium.org, yzaikin@...gle.com,
akpm@...ux-foundation.org, yamada.masahiro@...ionext.com,
catalin.marinas@....com, joe.lawrence@...hat.com,
penguin-kernel@...ove.sakura.ne.jp, urezki@...il.com,
andriy.shevchenko@...ux.intel.com, corbet@....net,
davidgow@...gle.com, adilger.kernel@...ger.ca, tytso@....edu,
mcgrof@...nel.org, linux-doc@...r.kernel.org,
Alan Maguire <alan.maguire@...cle.com>,
Knut Omang <knut.omang@...cle.com>
Subject: [PATCH v5 linux-kselftest-test 4/6] kunit: remove timeout dependence on sysctl_hung_task_timeout_seconds
In discussion of how to handle timeouts, it was noted that if
sysctl_hung_task_timeout_seconds is exceeded for a kunit test,
the test task will be killed and an oops generated. This should
suffice as a means of debugging such timeout issues for now.
Hence remove use of sysctl_hung_task_timeout_secs, which has the
added benefit of avoiding the need to export that symbol from
the core kernel.
Co-developed-by: Knut Omang <knut.omang@...cle.com>
Signed-off-by: Knut Omang <knut.omang@...cle.com>
Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
Reviewed-by: Stephen Boyd <sboyd@...nel.org>
---
lib/kunit/try-catch.c | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)
diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c
index 0247a28..0dd434e 100644
--- a/lib/kunit/try-catch.c
+++ b/lib/kunit/try-catch.c
@@ -11,7 +11,6 @@
#include <linux/completion.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
-#include <linux/sched/sysctl.h>
#include "try-catch-impl.h"
@@ -33,8 +32,6 @@ static int kunit_generic_run_threadfn_adapter(void *data)
static unsigned long kunit_test_timeout(void)
{
- unsigned long timeout_msecs;
-
/*
* TODO(brendanhiggins@...gle.com): We should probably have some type of
* variable timeout here. The only question is what that timeout value
@@ -51,22 +48,11 @@ static unsigned long kunit_test_timeout(void)
*
* For more background on this topic, see:
* https://mike-bland.com/2011/11/01/small-medium-large.html
+ *
+ * If tests timeout due to exceeding sysctl_hung_task_timeout_secs,
+ * the task will be killed and an oops generated.
*/
- if (sysctl_hung_task_timeout_secs) {
- /*
- * If sysctl_hung_task is active, just set the timeout to some
- * value less than that.
- *
- * In regards to the above TODO, if we decide on variable
- * timeouts, this logic will likely need to change.
- */
- timeout_msecs = (sysctl_hung_task_timeout_secs - 1) *
- MSEC_PER_SEC;
- } else {
- timeout_msecs = 300 * MSEC_PER_SEC; /* 5 min */
- }
-
- return timeout_msecs;
+ return 300 * MSEC_PER_SEC; /* 5 min */
}
void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
--
1.8.3.1
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