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63d0a91231
Currently, the in-kernel kunit test case timeout is 300 seconds. (There is a separate timeout mechanism for the whole test execution in kunit.py, but that's unrelated.) However, tests marked 'slow' or 'very slow' may timeout, particularly on slower machines. Implement a multiplier to the test-case timeout, so that slower tests have longer to complete: - DEFAULT -> 1x default timeout - KUNIT_SPEED_SLOW -> 3x default timeout - KUNIT_SPEED_VERY_SLOW -> 12x default timeout A further change is planned to allow user configuration of the default/base timeout to allow people with faster or slower machines to adjust these to their use-cases. Link: https://lore.kernel.org/r/20250614084711.2654593-2-davidgow@google.com Signed-off-by: Ujwal Jain <ujwaljain@google.com> Co-developed-by: David Gow <davidgow@google.com> Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Rae Moar <rmoar@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* An API to allow a function, that may fail, to be executed, and recover in a
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* controlled manner.
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*
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* Copyright (C) 2019, Google LLC.
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* Author: Brendan Higgins <brendanhiggins@google.com>
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*/
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#include <kunit/test.h>
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#include <linux/completion.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/sched/task.h>
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#include "try-catch-impl.h"
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void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
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{
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try_catch->try_result = -EFAULT;
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kthread_exit(0);
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}
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EXPORT_SYMBOL_GPL(kunit_try_catch_throw);
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static int kunit_generic_run_threadfn_adapter(void *data)
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{
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struct kunit_try_catch *try_catch = data;
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try_catch->try_result = -EINTR;
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try_catch->try(try_catch->context);
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if (try_catch->try_result == -EINTR)
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try_catch->try_result = 0;
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return 0;
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}
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void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
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{
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struct kunit *test = try_catch->test;
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struct task_struct *task_struct;
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struct completion *task_done;
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int exit_code, time_remaining;
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try_catch->context = context;
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try_catch->try_result = 0;
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task_struct = kthread_create(kunit_generic_run_threadfn_adapter,
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try_catch, "kunit_try_catch_thread");
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if (IS_ERR(task_struct)) {
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try_catch->try_result = PTR_ERR(task_struct);
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try_catch->catch(try_catch->context);
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return;
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}
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get_task_struct(task_struct);
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/*
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* As for a vfork(2), task_struct->vfork_done (pointing to the
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* underlying kthread->exited) can be used to wait for the end of a
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* kernel thread. It is set to NULL when the thread exits, so we
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* keep a copy here.
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*/
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task_done = task_struct->vfork_done;
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wake_up_process(task_struct);
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time_remaining = wait_for_completion_timeout(
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task_done, try_catch->timeout);
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if (time_remaining == 0) {
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try_catch->try_result = -ETIMEDOUT;
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kthread_stop(task_struct);
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}
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put_task_struct(task_struct);
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exit_code = try_catch->try_result;
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if (!exit_code)
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return;
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if (exit_code == -EFAULT)
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try_catch->try_result = 0;
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else if (exit_code == -EINTR) {
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if (test->last_seen.file)
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kunit_err(test, "try faulted: last line seen %s:%d\n",
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test->last_seen.file, test->last_seen.line);
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else
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kunit_err(test, "try faulted\n");
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} else if (exit_code == -ETIMEDOUT)
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kunit_err(test, "try timed out\n");
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else if (exit_code)
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kunit_err(test, "Unknown error: %d\n", exit_code);
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try_catch->catch(try_catch->context);
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}
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EXPORT_SYMBOL_GPL(kunit_try_catch_run);
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