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* rcutorture: Check GP completion at stutter endPaul E. McKenney2018-08-291-1/+2
| | | | | | | | | | | | | | | The rcu_torture_writer() function invokes stutter_wait() at the end of each writer pass, which occasionally blocks for an extended time period in order to ensure that RCU can handle intermittent loads. But part of handling a busy period is invoking all the callbacks before the end of the idle period induced by stutter_wait(). This commit therefore adds a return value to stutter_wait() indicating whether stutter_wait() actually waited. In addition, this commit causes rcu_torture_writer() to test this value and if set, checks that all the elements of the rcu_tortures[] array have been freed up. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Keep old-school dmesg formatPaul E. McKenney2018-06-251-0/+3
| | | | | | | | | | | | This commit adds "#define pr_fmt(fmt) fmt" to the torture-test files in order to keep the current dmesg format. Once Joe's commits have hit mainline, these definitions will be changed in order to automatically generate the dmesg line prefix that the scripts expect. This will have the beneficial side-effect of allowing printk() formats to be used more widely and of shortening some pr_*() lines. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Joe Perches <joe@perches.com>
* torture: Make online/offline messages appear only for verbose=2Paul E. McKenney2018-06-251-6/+6
| | | | | | | | | | | | Some bugs reproduce quickly only at high CPU-hotplug rates, so the rcutorture TREE03 scenario now has only 200 milliseconds spacing between CPU-hotplug operations. At this rate, the torture-test pair of console messages per operation becomes a bit voluminous. This commit therefore converts the torture-test set of "verbose" kernel-boot arguments from bool to int, and prints the extra console messages only when verbose=2. The default is still verbose=1. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()Paul E. McKenney2018-05-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit e31d28b6ab8f ("trace: Eliminate cond_resched_rcu_qs() in favor of cond_resched()") substituted cond_resched() for the earlier call to cond_resched_rcu_qs(). However, the new-age cond_resched() does not do anything to help RCU-tasks grace periods because (1) RCU-tasks is only enabled when CONFIG_PREEMPT=y and (2) cond_resched() is a complete no-op when preemption is enabled. This situation results in hangs when running the trace benchmarks. A number of potential fixes were discussed on LKML (https://lkml.kernel.org/r/20180224151240.0d63a059@vmware.local.home), including making cond_resched() not be a no-op; making cond_resched() not be a no-op, but only when running tracing benchmarks; reverting the aforementioned commit (which works because cond_resched_rcu_qs() does provide an RCU-tasks quiescent state; and adding a call to the scheduler/RCU rcu_note_voluntary_context_switch() function. All were deemed unsatisfactory, either due to added cond_resched() overhead or due to magic functions inviting cargo culting. This commit renames cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs(), which provides a clear hint as to what this function is doing and why and where it should be used, and then replaces the call to cond_resched() with cond_resched_tasks_rcu_qs() in the trace benchmark's benchmark_event_kthread() function. Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Nicholas Piggin <npiggin@gmail.com>
* torture: Save a line in stutter_wait(): while -> forPaul E. McKenney2017-12-111-2/+1
| | | | Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Eliminate torture_runnable and perf_runnablePaul E. McKenney2017-12-111-4/+2
| | | | | | | | | | | | | | | | | The purpose of torture_runnable is to allow rcutorture and locktorture to be started and stopped via sysfs when they are built into the kernel (as in not compiled as loadable modules). However, the 0444 permissions for both instances of torture_runnable prevent this use case from ever being put into practice. Given that there have been no complaints about this deficiency, it is reasonable to conclude that no one actually makes use of this sysfs capability. The perf_runnable module parameter for rcuperf is in the same situation. This commit therefore removes both torture_runnable instances as well as perf_runnable. Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Make stutter less vulnerable to compilers and racesPaul E. McKenney2017-12-111-16/+17
| | | | | | | | | | | | | The stutter_wait() function repeatedly fetched stutter_pause_test, and should really just fetch it once on each pass. The races should be harmless, but why have the races? Also, the whole point of the value "2" for stutter_pause_test is to get everyone to start at very nearly the same time, but the value "2" was the first jiffy of the stutter rather than the last jiffy of the stutter. This commit rearranges the code to be more sensible. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Suppress CPU stall warnings during shutdown ftrace dumpPaul E. McKenney2017-11-281-1/+2
| | | | | | | | | | The torture_shutdown() function directly invokes ftrace_dump(), which can result in RCU CPU stall warnings when the ftrace buffer is large, which it usually is. This commit therefore invoks rcu_ftrace_dump() in place of ftrace_dump(), suppressing RCU CPU stall warnings during this time. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Fix typo suppressing CPU-hotplug statisticsPaul E. McKenney2017-07-251-1/+1
| | | | | | | | | | | The torture status line contains a series of values preceded by "onoff:". The last value in that line, the one preceding the "HZ=" string, is always zero. The reason that it is always zero is that torture_offline() was incrementing the sum_offl pointer instead of the value that this pointer referenced. This commit therefore makes this increment operate on the statistic rather than the pointer to the statistic. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar2017-03-021-0/+1
| | | | | | | | | | | | | | | | | | | | <linux/sched/clock.h> We are going to split <linux/sched/clock.h> out of <linux/sched.h>, which will have to be picked up from other headers and .c files. Create a trivial placeholder <linux/sched/clock.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* scripts/spelling.txt: add "varible" pattern and fix typo instancesMasahiro Yamada2017-02-271-1/+1
| | | | | | | | | | | | | | | Fix typos and add the following to the scripts/spelling.txt: varible||variable While we are here, tidy up the comment blocks that fit in a single line for drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c and net/sctp/transport.c. Link: http://lkml.kernel.org/r/1481573103-11329-11-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* torture: Convert torture_shutdown() to hrtimerPaul E. McKenney2016-08-221-14/+13
| | | | | | | | | | | | | | Upcoming changes to the timer wheel introduce significant inaccuracy and possibly also an ultimate limit on timeout duration. This is a problem for the current implementation of torture_shutdown() because (1) shutdown times are user-specified, and can therefore be quite long, and (2) the torture scripting will kill a test instance that runs for more than a few minutes longer than scheduled. This commit therefore converts the torture_shutdown() timed waits to an hrtimer, thus avoiding too-short torture test runs as well as death by scripting. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
* torture: Stop onoff task if there is only one cpuBoqun Feng2016-06-141-0/+8
| | | | | | | | If the whole system has only one cpu, that cpu won't be able to be offlined, so there is no need onoff task is stil running. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Break online and offline functions out of torture_onoff()Paul E. McKenney2016-06-141-64/+104
| | | | | | | | This commit breaks torture_online() and torture_offline() out of torture_onoff() in preparation for allowing waketorture finer-grained control of its CPU-hotplug workload. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcutorture: Dump trace buffer upon shutdownPaul E. McKenney2016-04-211-0/+1
| | | | | | | | | | When running from the scripts, rcutorture is completely headless, so there is no way to to manually dump the trace buffer. This commit therefore unconditionally dumps the trace buffer upon timed shutdown. However, if you are using rmmod to end the test, it is still up to you to manually dump the trace buffer. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Clarify refusal to run more than one torture testPaul E. McKenney2016-03-311-1/+2
| | | | | | | This commit clarifies error messages -- you only get to run one torture test at a time! Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Consolidate cond_resched_rcu_qs() into stutter_wait()Paul E. McKenney2015-10-061-0/+1
| | | | | | | | | This commit moves cond_resched_rcu_qs() into stutter_wait(), saving a line and also avoiding RCU CPU stall warnings from all torture loops containing a stutter_wait(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE()Paul E. McKenney2015-05-271-13/+13
| | | | | | | | This commit moves from the old ACCESS_ONCE() API to the new READ_ONCE() and WRITE_ONCE() APIs. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Updated to include kernel/torture.c as suggested by Jason Low. ]
* torture: Address race in module cleanupDavidlohr Bueso2014-09-161-3/+13
| | | | | | | | | | | | | | | | | | When performing module cleanups by calling torture_cleanup() the 'torture_type' string in nullified However, callers are not necessarily done, and might still need to reference the variable. This impacts both rcutorture and locktorture, causing printing things like: [ 94.226618] (null)-torture: Stopping lock_torture_writer task [ 94.226624] (null)-torture: Stopping lock_torture_stats task Thus delay this operation until the very end of the cleanup process. The consequence (which shouldn't matter for this kid of program) is, of course, that we delay the window between rmmod and modprobing, for instance in module_torture_begin(). Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Use pr_alert/pr_cont for printing logsJoe Perches2014-09-071-9/+7
| | | | | | | | | | | | | | | | | | User pr_alert/pr_cont for printing the logs from rcutorture module directly instead of writing it to a buffer and then printing it. This allows us from not having to allocate such buffers. Also remove a resulting empty function. I tested this using the parse-torture.sh script as follows: $ dmesg | grep torture > log.txt $ bash parse-torture.sh log.txt test $ There were no warnings which means that parsing went fine. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* torture: Avoid format string leak to thead nameKees Cook2014-07-071-1/+1
| | | | | | | | | | Since the torture-test thread creation interface does not include format string arguments, this commit makes sure the name can never be accidentally processed as a format string. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* torture: Remove __init from torture_init_begin/endPranith Kumar2014-05-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Loading rcutorture as a module (as opposed to building it directly into the kernel) results in the following splat: [Wed Apr 16 15:29:33 2014] BUG: unable to handle kernel paging request at ffffffffa0003000 [Wed Apr 16 15:29:33 2014] IP: [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] PGD 1c0f067 PUD 1c10063 PMD 378a6067 PTE 0 [Wed Apr 16 15:29:33 2014] Oops: 0010 [#1] SMP [Wed Apr 16 15:29:33 2014] Modules linked in: rcutorture(+) torture [Wed Apr 16 15:29:33 2014] CPU: 0 PID: 4257 Comm: modprobe Not tainted 3.15.0-rc1 #10 [Wed Apr 16 15:29:33 2014] Hardware name: innotek GmbH VirtualBox, BIOS VirtualBox 12/01/2006 [Wed Apr 16 15:29:33 2014] task: ffff8800db1e88d0 ti: ffff8800db25c000 task.ti: ffff8800db25c000 [Wed Apr 16 15:29:33 2014] RIP: 0010:[<ffffffffa0003000>] [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP: 0018:ffff8800db25dca0 EFLAGS: 00010282 [Wed Apr 16 15:29:33 2014] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [Wed Apr 16 15:29:33 2014] RDX: ffffffffa00090a8 RSI: 0000000000000001 RDI: ffffffffa0008337 [Wed Apr 16 15:29:33 2014] RBP: ffff8800db25dd50 R08: 0000000000000000 R09: 0000000000000000 [Wed Apr 16 15:29:33 2014] R10: ffffea000357b680 R11: ffffffff8113257a R12: ffffffffa000d000 [Wed Apr 16 15:29:33 2014] R13: ffffffffa00094c0 R14: ffffffffa0009510 R15: 0000000000000001 [Wed Apr 16 15:29:33 2014] FS: 00007fee30ce5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [Wed Apr 16 15:29:33 2014] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 CR3: 00000000d5eb1000 CR4: 00000000000006f0 [Wed Apr 16 15:29:33 2014] Stack: [Wed Apr 16 15:29:33 2014] ffffffffa000d02c 0000000000000000 ffff88021700d400 0000000000000000 [Wed Apr 16 15:29:33 2014] ffff8800db25dd40 ffffffff81647951 ffff8802162bd000 ffff88021541846c [Wed Apr 16 15:29:33 2014] 0000000000000000 ffffffff817dbe2d ffffffff817dbe2d 0000000000000001 [Wed Apr 16 15:29:33 2014] Call Trace: [Wed Apr 16 15:29:33 2014] [<ffffffffa000d02c>] ? rcu_torture_init+0x2c/0x8b4 [rcutorture] [Wed Apr 16 15:29:33 2014] [<ffffffff81647951>] ? netlink_broadcast_filtered+0x121/0x3a0 [Wed Apr 16 15:29:33 2014] [<ffffffff817dbe2d>] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [<ffffffff817dbe2d>] ? mutex_lock+0xd/0x2a [Wed Apr 16 15:29:33 2014] [<ffffffff810e7022>] ? trace_module_notify+0x62/0x1d0 [Wed Apr 16 15:29:33 2014] [<ffffffffa000d000>] ? 0xffffffffa000cfff [Wed Apr 16 15:29:33 2014] [<ffffffff8100034a>] do_one_initcall+0xfa/0x140 [Wed Apr 16 15:29:33 2014] [<ffffffff8106b4ce>] ? __blocking_notifier_call_chain+0x5e/0x80 [Wed Apr 16 15:29:33 2014] [<ffffffff810b3481>] load_module+0x1931/0x21b0 [Wed Apr 16 15:29:33 2014] [<ffffffff810b0330>] ? show_initstate+0x50/0x50 [Wed Apr 16 15:29:33 2014] [<ffffffff810b3d9e>] SyS_init_module+0x9e/0xc0 [Wed Apr 16 15:29:33 2014] [<ffffffff817e4c22>] system_call_fastpath+0x16/0x1b [Wed Apr 16 15:29:33 2014] Code: Bad RIP value. [Wed Apr 16 15:29:33 2014] RIP [<ffffffffa0003000>] 0xffffffffa0003000 [Wed Apr 16 15:29:33 2014] RSP <ffff8800db25dca0> [Wed Apr 16 15:29:33 2014] CR2: ffffffffa0003000 [Wed Apr 16 15:29:33 2014] ---[ end trace 3e88c173037af84b ]--- This splat is due to the fact that torture_init_begin() and torture_init_end() are both marked with __init, despite their use at runtime. This commit therefore removes __init from both functions. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* torture: Check for multiple concurrent torture testsPaul E. McKenney2014-05-141-2/+11
| | | | | | | | | The torture tests are designed to run in isolation, but do not enforce this isolation. This commit therefore checks for concurrent torture tests, and refuses to start new tests while old tests are running. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* torture: Notice if an all-zero cpumask is passed inside a critical sectionIulia Manda2014-05-141-6/+1
| | | | | | | | | | | | | | | | | In torture_shuffle_tasks function, the check if an all-zero mask can be passed to set_cpus_allowed_ptr() is redundant after clearing the shuffle_idle_cpu bit. If the mask had more than one bit set, after clearing a bit it has at least one bit set. If the mask had only one bit set, a check is made at the beginning, where the function returns, as there is no need to shuffle only one cpu. Also, this code is executed inside a critical section, delimited by get_online_cpus(), and put_online_cpus(), preventing CPUs from leaving between the check of num_online_cpus and the calls to set_cpus_allowed_ptr() function. Signed-off-by: Iulia Manda <iulia.manda21@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* torture: Increase stutter-end intensityPaul E. McKenney2014-05-141-2/+10
| | | | | | | | | | | | Currently, all stuttered kthreads block a jiffy at a time, which can result in them starting at different times. (Note: This is not an energy-efficiency problem unless you run torture tests in production, in which case you have other problems!) This commit increases the intensity of the restart event by causing kthreads to spin through the last jiffy, restarting when they see the variable change. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* torture: Include "Stopping" string to torture_kthread_stopping()Paul E. McKenney2014-05-141-2/+4
| | | | | | | | Currently, torture_kthread_stopping() prints only the name of the kthread that is stopping, which can be unedifying. This commit therefore adds "Stopping" to make things more evident. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcutorture: Gracefully handle NULL cleanup hooksPaul E. McKenney2014-02-231-1/+4
| | | | | | | | | Although most torture tests will have some cleanup hook, it is possible that one might not. This commit therefore enables graceful handling of a NULL cleanup hook during torture-test shutdown. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Stop generic kthreads in torture_cleanup()Paul E. McKenney2014-02-231-18/+19
| | | | | | | | | | The specific torture modules (like rcutorture) need to call torture_cleanup() in any case, so this commit makes torture_cleanup() deal with torture_shutdown_cleanup() and torture_stutter_cleanup() so that the specific modules don't have to deal with these details. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_stop_kthread()Paul E. McKenney2014-02-231-0/+13
| | | | | | | | Stopping of kthreads is not RCU-specific, so this commit abstracts out torture_stop_kthread(), saving a few lines of code in the process. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_create_kthread()Paul E. McKenney2014-02-231-47/+33
| | | | | | | | | | | | | Creation of kthreads is not RCU-specific, so this commit abstracts out torture_create_kthread(), saving a few tens of lines of code in the process. This change requires modifying VERBOSE_TOROUT_ERRSTRING() to take a non-const string, so that _torture_create_kthread() can avoid an open-coded substitute. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Fix rcutorture shutdown racesPaul E. McKenney2014-02-231-4/+22
| | | | | | | | | | | | | | | | | Not all of the rcutorture kthreads waited for kthread_should_stop() before returning from their top-level functions, and none of them used torture_shutdown_absorb() properly. These problems can result in segfaults and hangs at shutdown time, and some recent changes perturbed timing sufficiently to make them much more probable. This commit therefore creates a torture_kthread_stopping() function that does the proper kthread shutdown dance in one centralized location. Accommodate this grouping by making VERBOSE_TOROUT_STRING() capable of taking a non-const string as its argument, which allows the new torture_kthread_stopping() to pass its "title" argument directly to the updated version of VERBOSE_TOROUT_STRING(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcutorture: Announce task creationPaul E. McKenney2014-02-231-0/+4
| | | | | | | | | A few "stealth-start rcutorture kthreads" have accumulated over the years, so this commit adds console-log announcements (but only if the torture tests are running verbose). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_shutdown()Paul E. McKenney2014-02-231-0/+84
| | | | | | | | Because auto-shutdown of torture testing is not specific to RCU, this commit moves the auto-shutdown function to kernel/torture.c. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Apply ACCESS_ONCE() to racy fullstop accessesPaul E. McKenney2014-02-231-5/+5
| | | | | | | | | Because the fullstop variable can be accessed while it is being updated, this commit avoids any resulting compiler mischief through use of ACCESS_ONCE() for non-initialization accesses to this shared variable. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract stutter_wait()Paul E. McKenney2014-02-231-1/+86
| | | | | | | | | Because stuttering the test load (stopping and restarting it) is useful for non-RCU testing, this commit moves the load-stuttering functionality to kernel/torture.c. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Add diagnostic for unscheduled system shutdownPaul E. McKenney2014-02-231-2/+4
| | | | | | | | | | Currently, rcutorture can terminate via rmmod, via self-shutdown, via something else shutting the system down, or of course the usual catastrophic termination. The first two get flagged, so this commit adds a message for the third. For the fourth, your warranty is void as always. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Privatize fullstopPaul E. McKenney2014-02-231-2/+25
| | | | | | | | | | This commit introduces the torture_must_stop() function in order to keep use of the fullstop variable local to kernel/torture.c. There is also a torture_must_stop_irq() counterpart for use from RCU callbacks, timeout handlers, and the like. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_shutdown_notify()Paul E. McKenney2014-02-231-5/+24
| | | | | | | | | | Because handling the race between rmmod and system shutdown is not specific to RCU, this commit abstracts torture_shutdown_notify(), placing this code into kernel/torture.c. This change also allows fullstop_mutex to be private to kernel/torture.c. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture-test cleanupPaul E. McKenney2014-02-231-2/+28
| | | | | | | | This commit creates a torture_cleanup() that handles the generic cleanup actions local to kernel/torture.c. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture-test initializationPaul E. McKenney2014-02-231-0/+27
| | | | | | | | | | This commit creates torture_init_begin() and torture_init_end() functions to abstract locking and allow the torture_type and verbose variables in kernel/torture.o to become static. With a bit more abstraction, fullstop_mutex will also become static. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_onoff()Paul E. McKenney2014-02-231-0/+186
| | | | | | | | | Because online/offline torturing is not specific to RCU, this commit abstracts it into the kernel/torture.c module to allow other torture tests to use it. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_shuffle()Paul E. McKenney2014-02-231-0/+151
| | | | | | | | | | | The torture_shuffle() function forces each CPU in turn to go idle periodically in order to check for problems interacting with per-CPU variables and with dyntick-idle mode. Because this sort of debugging is not specific to RCU, this commit abstracts that functionality. This in turn requires abstracting some additional infrastructure. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcutorture: Abstract torture_shutdown_absorb()Paul E. McKenney2014-02-231-0/+20
| | | | | | | | | | | | | | | Because handling races between rmmod and normal shutdown is not specific to rcutorture, this commit renames rcutorture_shutdown_absorb() to torture_shutdown_absorb() and pulls it out into then kernel/torture.c module. This implies pulling the fullstop mechanism into kernel/torture.c as well. The exporting of fullstop and fullstop_mutex is ugly and must die. And it does in fact die in later commits that introduce higher-level APIs that encapsulate both of these variables. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>`
* rcutorture: Abstract rcu_torture_random()Paul E. McKenney2014-02-231-0/+71
Because rcu_torture_random() will be used by the locking equivalent to rcutorture, pull it out into its own module. This new module cannot be separately configured, instead, use the Kconfig "select" statement from the Kconfig options of tests depending on it. Suggested-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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