From: Joel Fernandes <joelaf@google.com> To: linux-kernel@vger.kernel.org Cc: kernel-team@android.com, "Joel Fernandes (Google)" <joel@joelfernandes.org>, Boqun Feng <boqun.feng@gmail.com>, Byungchul Park <byungchul.park@lge.com>, Erick Reyes <erickreyes@google.com>, Ingo Molnar <mingo@redhat.com>, Julia Cartwright <julia@ni.com>, linux-kselftest@vger.kernel.org, Masami Hiramatsu <mhiramat@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Namhyung Kim <namhyung@kernel.org>, Paul McKenney <paulmck@linux.vnet.ibm.com>, Peter Zijlstra <peterz@infradead.org>, Shuah Khan <shuah@kernel.org>, Steven Rostedt <rostedt@goodmis.org>, Thomas Glexiner <tglx@linutronix.de>, Todd Kjos <tkjos@google.com>, Tom Zanussi <tom.zanussi@linux.intel.com> Subject: [PATCH v8 5/8] tracepoint: Make rcuidle tracepoint callers use SRCU Date: Tue, 29 May 2018 17:04:57 -0700 [thread overview] Message-ID: <20180530000500.257225-6-joel@joelfernandes.org> (raw) In-Reply-To: <20180530000500.257225-1-joel@joelfernandes.org> From: "Joel Fernandes (Google)" <joel@joelfernandes.org> In recent tests with IRQ on/off tracepoints, a large performance overhead ~10% is noticed when running hackbench. This is root caused to calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the tracepoint code. Following a long discussion on the list [1] about this, we concluded that srcu is a better alternative for use during rcu idle. Although it does involve extra barriers, its lighter than the sched-rcu version which has to do additional RCU calls to notify RCU idle about entry into RCU sections. In this patch, we change the underlying implementation of the trace_*_rcuidle API to use SRCU. This has shown to improve performance alot for the high frequency irq enable/disable tracepoints. Test: Tested idle and preempt/irq tracepoints. Here are some performance numbers: With a run of the following 30 times on a single core x86 Qemu instance with 1GB memory: hackbench -g 4 -f 2 -l 3000 Completion times in seconds. CONFIG_PROVE_LOCKING=y. No patches (without this series) Mean: 3.048 Median: 3.025 Std Dev: 0.064 With Lockdep using irq tracepoints with RCU implementation: Mean: 3.451 (-11.66 %) Median: 3.447 (-12.22%) Std Dev: 0.049 With Lockdep using irq tracepoints with SRCU implementation (this series): Mean: 3.020 (I would consider the improvement against the "without this series" case as just noise). Median: 3.013 Std Dev: 0.033 [1] https://patchwork.kernel.org/patch/10344297/ Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> --- include/linux/tracepoint.h | 48 +++++++++++++++++++++++++++++++------- kernel/tracepoint.c | 15 +++++++++++- 2 files changed, 54 insertions(+), 9 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index c94f466d57ef..880794207921 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -15,6 +15,7 @@ */ #include <linux/smp.h> +#include <linux/srcu.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/cpumask.h> @@ -33,6 +34,8 @@ struct trace_eval_map { #define TRACEPOINT_DEFAULT_PRIO 10 +extern struct srcu_struct tracepoint_srcu; + extern int tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data); extern int @@ -75,10 +78,15 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb) * probe unregistration and the end of module exit to make sure there is no * caller executing a probe when it is freed. */ +#ifdef CONFIG_TRACEPOINTS static inline void tracepoint_synchronize_unregister(void) { + synchronize_srcu(&tracepoint_srcu); synchronize_sched(); } +#else +static inline void tracepoint_synchronize_unregister(void) { } +#endif #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS extern int syscall_regfunc(void); @@ -129,18 +137,38 @@ extern void syscall_unregfunc(void); * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto". */ -#define __DO_TRACE(tp, proto, args, cond, rcucheck) \ +#define __DO_TRACE(tp, proto, args, cond, rcuidle) \ do { \ struct tracepoint_func *it_func_ptr; \ void *it_func; \ void *__data; \ + int __maybe_unused idx = 0; \ \ if (!(cond)) \ return; \ - if (rcucheck) \ - rcu_irq_enter_irqson(); \ - rcu_read_lock_sched_notrace(); \ - it_func_ptr = rcu_dereference_sched((tp)->funcs); \ + \ + /* \ + * For rcuidle callers, use srcu since sched-rcu \ + * doesn't work from the idle path. \ + */ \ + if (rcuidle) { \ + if (in_nmi()) { \ + WARN_ON_ONCE(1); \ + return; /* no srcu from nmi */ \ + } \ + \ + idx = srcu_read_lock_notrace(&tracepoint_srcu); \ + it_func_ptr = \ + srcu_dereference_notrace((tp)->funcs, \ + &tracepoint_srcu); \ + /* To keep it consistent with !rcuidle path */ \ + preempt_disable_notrace(); \ + } else { \ + rcu_read_lock_sched_notrace(); \ + it_func_ptr = \ + rcu_dereference_sched((tp)->funcs); \ + } \ + \ if (it_func_ptr) { \ do { \ it_func = (it_func_ptr)->func; \ @@ -148,9 +176,13 @@ extern void syscall_unregfunc(void); ((void(*)(proto))(it_func))(args); \ } while ((++it_func_ptr)->func); \ } \ - rcu_read_unlock_sched_notrace(); \ - if (rcucheck) \ - rcu_irq_exit_irqson(); \ + \ + if (rcuidle) { \ + preempt_enable_notrace(); \ + srcu_read_unlock_notrace(&tracepoint_srcu, idx);\ + } else { \ + rcu_read_unlock_sched_notrace(); \ + } \ } while (0) #ifndef MODULE diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 1e37da2e0c25..54157792f5ab 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -31,6 +31,9 @@ extern struct tracepoint * const __start___tracepoints_ptrs[]; extern struct tracepoint * const __stop___tracepoints_ptrs[]; +DEFINE_SRCU(tracepoint_srcu); +EXPORT_SYMBOL_GPL(tracepoint_srcu); + /* Set to 1 to enable tracepoint debug output */ static const int tracepoint_debug; @@ -67,16 +70,26 @@ static inline void *allocate_probes(int count) return p == NULL ? NULL : p->probes; } -static void rcu_free_old_probes(struct rcu_head *head) +static void srcu_free_old_probes(struct rcu_head *head) { kfree(container_of(head, struct tp_probes, rcu)); } +static void rcu_free_old_probes(struct rcu_head *head) +{ + call_srcu(&tracepoint_srcu, head, srcu_free_old_probes); +} + static inline void release_probes(struct tracepoint_func *old) { if (old) { struct tp_probes *tp_probes = container_of(old, struct tp_probes, probes[0]); + /* + * Tracepoint probes are protected by both sched RCU and SRCU, + * by calling the SRCU callback in the sched RCU callback we + * cover both cases. So lets chain the SRCU and RCU callbacks. + */ call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes); } } -- 2.17.0.921.gf22659ad46-goog
WARNING: multiple messages have this Message-ID
From: joelaf at google.com (Joel Fernandes) Subject: [PATCH v8 5/8] tracepoint: Make rcuidle tracepoint callers use SRCU Date: Tue, 29 May 2018 17:04:57 -0700 [thread overview] Message-ID: <20180530000500.257225-6-joel@joelfernandes.org> (raw) In-Reply-To: <20180530000500.257225-1-joel@joelfernandes.org> From: "Joel Fernandes (Google)" <joel at joelfernandes.org> In recent tests with IRQ on/off tracepoints, a large performance overhead ~10% is noticed when running hackbench. This is root caused to calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the tracepoint code. Following a long discussion on the list [1] about this, we concluded that srcu is a better alternative for use during rcu idle. Although it does involve extra barriers, its lighter than the sched-rcu version which has to do additional RCU calls to notify RCU idle about entry into RCU sections. In this patch, we change the underlying implementation of the trace_*_rcuidle API to use SRCU. This has shown to improve performance alot for the high frequency irq enable/disable tracepoints. Test: Tested idle and preempt/irq tracepoints. Here are some performance numbers: With a run of the following 30 times on a single core x86 Qemu instance with 1GB memory: hackbench -g 4 -f 2 -l 3000 Completion times in seconds. CONFIG_PROVE_LOCKING=y. No patches (without this series) Mean: 3.048 Median: 3.025 Std Dev: 0.064 With Lockdep using irq tracepoints with RCU implementation: Mean: 3.451 (-11.66 %) Median: 3.447 (-12.22%) Std Dev: 0.049 With Lockdep using irq tracepoints with SRCU implementation (this series): Mean: 3.020 (I would consider the improvement against the "without this series" case as just noise). Median: 3.013 Std Dev: 0.033 [1] https://patchwork.kernel.org/patch/10344297/ Signed-off-by: Joel Fernandes (Google) <joel at joelfernandes.org> --- include/linux/tracepoint.h | 48 +++++++++++++++++++++++++++++++------- kernel/tracepoint.c | 15 +++++++++++- 2 files changed, 54 insertions(+), 9 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index c94f466d57ef..880794207921 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -15,6 +15,7 @@ */ #include <linux/smp.h> +#include <linux/srcu.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/cpumask.h> @@ -33,6 +34,8 @@ struct trace_eval_map { #define TRACEPOINT_DEFAULT_PRIO 10 +extern struct srcu_struct tracepoint_srcu; + extern int tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data); extern int @@ -75,10 +78,15 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb) * probe unregistration and the end of module exit to make sure there is no * caller executing a probe when it is freed. */ +#ifdef CONFIG_TRACEPOINTS static inline void tracepoint_synchronize_unregister(void) { + synchronize_srcu(&tracepoint_srcu); synchronize_sched(); } +#else +static inline void tracepoint_synchronize_unregister(void) { } +#endif #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS extern int syscall_regfunc(void); @@ -129,18 +137,38 @@ extern void syscall_unregfunc(void); * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto". */ -#define __DO_TRACE(tp, proto, args, cond, rcucheck) \ +#define __DO_TRACE(tp, proto, args, cond, rcuidle) \ do { \ struct tracepoint_func *it_func_ptr; \ void *it_func; \ void *__data; \ + int __maybe_unused idx = 0; \ \ if (!(cond)) \ return; \ - if (rcucheck) \ - rcu_irq_enter_irqson(); \ - rcu_read_lock_sched_notrace(); \ - it_func_ptr = rcu_dereference_sched((tp)->funcs); \ + \ + /* \ + * For rcuidle callers, use srcu since sched-rcu \ + * doesn't work from the idle path. \ + */ \ + if (rcuidle) { \ + if (in_nmi()) { \ + WARN_ON_ONCE(1); \ + return; /* no srcu from nmi */ \ + } \ + \ + idx = srcu_read_lock_notrace(&tracepoint_srcu); \ + it_func_ptr = \ + srcu_dereference_notrace((tp)->funcs, \ + &tracepoint_srcu); \ + /* To keep it consistent with !rcuidle path */ \ + preempt_disable_notrace(); \ + } else { \ + rcu_read_lock_sched_notrace(); \ + it_func_ptr = \ + rcu_dereference_sched((tp)->funcs); \ + } \ + \ if (it_func_ptr) { \ do { \ it_func = (it_func_ptr)->func; \ @@ -148,9 +176,13 @@ extern void syscall_unregfunc(void); ((void(*)(proto))(it_func))(args); \ } while ((++it_func_ptr)->func); \ } \ - rcu_read_unlock_sched_notrace(); \ - if (rcucheck) \ - rcu_irq_exit_irqson(); \ + \ + if (rcuidle) { \ + preempt_enable_notrace(); \ + srcu_read_unlock_notrace(&tracepoint_srcu, idx);\ + } else { \ + rcu_read_unlock_sched_notrace(); \ + } \ } while (0) #ifndef MODULE diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 1e37da2e0c25..54157792f5ab 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -31,6 +31,9 @@ extern struct tracepoint * const __start___tracepoints_ptrs[]; extern struct tracepoint * const __stop___tracepoints_ptrs[]; +DEFINE_SRCU(tracepoint_srcu); +EXPORT_SYMBOL_GPL(tracepoint_srcu); + /* Set to 1 to enable tracepoint debug output */ static const int tracepoint_debug; @@ -67,16 +70,26 @@ static inline void *allocate_probes(int count) return p == NULL ? NULL : p->probes; } -static void rcu_free_old_probes(struct rcu_head *head) +static void srcu_free_old_probes(struct rcu_head *head) { kfree(container_of(head, struct tp_probes, rcu)); } +static void rcu_free_old_probes(struct rcu_head *head) +{ + call_srcu(&tracepoint_srcu, head, srcu_free_old_probes); +} + static inline void release_probes(struct tracepoint_func *old) { if (old) { struct tp_probes *tp_probes = container_of(old, struct tp_probes, probes[0]); + /* + * Tracepoint probes are protected by both sched RCU and SRCU, + * by calling the SRCU callback in the sched RCU callback we + * cover both cases. So lets chain the SRCU and RCU callbacks. + */ call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes); } } -- 2.17.0.921.gf22659ad46-goog -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID
From: joelaf@google.com (Joel Fernandes) Subject: [PATCH v8 5/8] tracepoint: Make rcuidle tracepoint callers use SRCU Date: Tue, 29 May 2018 17:04:57 -0700 [thread overview] Message-ID: <20180530000500.257225-6-joel@joelfernandes.org> (raw) Message-ID: <20180530000457.YXkBrxDepcf-AKuPYQjvbqVTc6vvZ5z6n6Eu1ofsvHg@z> (raw) In-Reply-To: <20180530000500.257225-1-joel@joelfernandes.org> From: "Joel Fernandes (Google)" <joel@joelfernandes.org> In recent tests with IRQ on/off tracepoints, a large performance overhead ~10% is noticed when running hackbench. This is root caused to calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the tracepoint code. Following a long discussion on the list [1] about this, we concluded that srcu is a better alternative for use during rcu idle. Although it does involve extra barriers, its lighter than the sched-rcu version which has to do additional RCU calls to notify RCU idle about entry into RCU sections. In this patch, we change the underlying implementation of the trace_*_rcuidle API to use SRCU. This has shown to improve performance alot for the high frequency irq enable/disable tracepoints. Test: Tested idle and preempt/irq tracepoints. Here are some performance numbers: With a run of the following 30 times on a single core x86 Qemu instance with 1GB memory: hackbench -g 4 -f 2 -l 3000 Completion times in seconds. CONFIG_PROVE_LOCKING=y. No patches (without this series) Mean: 3.048 Median: 3.025 Std Dev: 0.064 With Lockdep using irq tracepoints with RCU implementation: Mean: 3.451 (-11.66 %) Median: 3.447 (-12.22%) Std Dev: 0.049 With Lockdep using irq tracepoints with SRCU implementation (this series): Mean: 3.020 (I would consider the improvement against the "without this series" case as just noise). Median: 3.013 Std Dev: 0.033 [1] https://patchwork.kernel.org/patch/10344297/ Signed-off-by: Joel Fernandes (Google) <joel at joelfernandes.org> --- include/linux/tracepoint.h | 48 +++++++++++++++++++++++++++++++------- kernel/tracepoint.c | 15 +++++++++++- 2 files changed, 54 insertions(+), 9 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index c94f466d57ef..880794207921 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -15,6 +15,7 @@ */ #include <linux/smp.h> +#include <linux/srcu.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/cpumask.h> @@ -33,6 +34,8 @@ struct trace_eval_map { #define TRACEPOINT_DEFAULT_PRIO 10 +extern struct srcu_struct tracepoint_srcu; + extern int tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data); extern int @@ -75,10 +78,15 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb) * probe unregistration and the end of module exit to make sure there is no * caller executing a probe when it is freed. */ +#ifdef CONFIG_TRACEPOINTS static inline void tracepoint_synchronize_unregister(void) { + synchronize_srcu(&tracepoint_srcu); synchronize_sched(); } +#else +static inline void tracepoint_synchronize_unregister(void) { } +#endif #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS extern int syscall_regfunc(void); @@ -129,18 +137,38 @@ extern void syscall_unregfunc(void); * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto". */ -#define __DO_TRACE(tp, proto, args, cond, rcucheck) \ +#define __DO_TRACE(tp, proto, args, cond, rcuidle) \ do { \ struct tracepoint_func *it_func_ptr; \ void *it_func; \ void *__data; \ + int __maybe_unused idx = 0; \ \ if (!(cond)) \ return; \ - if (rcucheck) \ - rcu_irq_enter_irqson(); \ - rcu_read_lock_sched_notrace(); \ - it_func_ptr = rcu_dereference_sched((tp)->funcs); \ + \ + /* \ + * For rcuidle callers, use srcu since sched-rcu \ + * doesn't work from the idle path. \ + */ \ + if (rcuidle) { \ + if (in_nmi()) { \ + WARN_ON_ONCE(1); \ + return; /* no srcu from nmi */ \ + } \ + \ + idx = srcu_read_lock_notrace(&tracepoint_srcu); \ + it_func_ptr = \ + srcu_dereference_notrace((tp)->funcs, \ + &tracepoint_srcu); \ + /* To keep it consistent with !rcuidle path */ \ + preempt_disable_notrace(); \ + } else { \ + rcu_read_lock_sched_notrace(); \ + it_func_ptr = \ + rcu_dereference_sched((tp)->funcs); \ + } \ + \ if (it_func_ptr) { \ do { \ it_func = (it_func_ptr)->func; \ @@ -148,9 +176,13 @@ extern void syscall_unregfunc(void); ((void(*)(proto))(it_func))(args); \ } while ((++it_func_ptr)->func); \ } \ - rcu_read_unlock_sched_notrace(); \ - if (rcucheck) \ - rcu_irq_exit_irqson(); \ + \ + if (rcuidle) { \ + preempt_enable_notrace(); \ + srcu_read_unlock_notrace(&tracepoint_srcu, idx);\ + } else { \ + rcu_read_unlock_sched_notrace(); \ + } \ } while (0) #ifndef MODULE diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 1e37da2e0c25..54157792f5ab 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -31,6 +31,9 @@ extern struct tracepoint * const __start___tracepoints_ptrs[]; extern struct tracepoint * const __stop___tracepoints_ptrs[]; +DEFINE_SRCU(tracepoint_srcu); +EXPORT_SYMBOL_GPL(tracepoint_srcu); + /* Set to 1 to enable tracepoint debug output */ static const int tracepoint_debug; @@ -67,16 +70,26 @@ static inline void *allocate_probes(int count) return p == NULL ? NULL : p->probes; } -static void rcu_free_old_probes(struct rcu_head *head) +static void srcu_free_old_probes(struct rcu_head *head) { kfree(container_of(head, struct tp_probes, rcu)); } +static void rcu_free_old_probes(struct rcu_head *head) +{ + call_srcu(&tracepoint_srcu, head, srcu_free_old_probes); +} + static inline void release_probes(struct tracepoint_func *old) { if (old) { struct tp_probes *tp_probes = container_of(old, struct tp_probes, probes[0]); + /* + * Tracepoint probes are protected by both sched RCU and SRCU, + * by calling the SRCU callback in the sched RCU callback we + * cover both cases. So lets chain the SRCU and RCU callbacks. + */ call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes); } } -- 2.17.0.921.gf22659ad46-goog -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-05-30 0:06 UTC|newest] Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-05-30 0:04 [PATCH v8 0/8] Centralize and unify usage of preempt/irq tracepoints Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-30 0:04 ` [PATCH v8 1/8] softirq: reorder trace_softirqs_on to prevent lockdep splat Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-30 0:04 ` [PATCH v8 2/8] srcu: Add notrace variants of srcu_read_{lock,unlock} Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-30 0:04 ` [PATCH v8 3/8] srcu: Add notrace variant of srcu_dereference Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-30 0:04 ` [PATCH v8 4/8] trace/irqsoff: Split reset into separate functions Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-30 0:04 ` Joel Fernandes [this message] 2018-05-30 0:04 ` [PATCH v8 5/8] tracepoint: Make rcuidle tracepoint callers use SRCU Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-31 6:50 ` Mathieu Desnoyers 2018-05-31 6:50 ` Mathieu Desnoyers 2018-05-31 6:50 ` mathieu.desnoyers 2018-05-31 17:51 ` Joel Fernandes 2018-05-31 17:51 ` Joel Fernandes 2018-05-31 17:51 ` joel 2018-06-02 1:17 ` Mathieu Desnoyers 2018-06-02 1:17 ` Mathieu Desnoyers 2018-06-02 1:17 ` mathieu.desnoyers 2018-05-30 0:04 ` [PATCH v8 6/8] tracing: Centralize preemptirq tracepoints and unify their usage Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-05-31 1:56 ` Namhyung Kim 2018-05-31 1:56 ` Namhyung Kim 2018-05-31 1:56 ` namhyung 2018-05-31 6:26 ` Joel Fernandes 2018-05-31 6:26 ` Joel Fernandes 2018-05-31 6:26 ` joel 2018-05-30 0:04 ` [PATCH v8 7/8] lib: Add module to simulate atomic sections for testing preemptoff tracers Joel Fernandes 2018-05-30 0:04 ` Joel Fernandes 2018-05-30 0:04 ` joelaf 2018-06-05 23:01 ` Joel Fernandes 2018-06-05 23:01 ` Joel Fernandes 2018-06-05 23:01 ` joel 2018-06-05 23:53 ` Joel Fernandes 2018-06-05 23:53 ` Joel Fernandes 2018-06-05 23:53 ` joel 2018-06-06 7:48 ` Andy Shevchenko 2018-06-06 7:48 ` Andy Shevchenko 2018-06-06 7:48 ` andriy.shevchenko 2018-05-30 0:05 ` [PATCH v8 8/8] kselftests: Add tests for the preemptoff and irqsoff tracers Joel Fernandes 2018-05-30 0:05 ` Joel Fernandes 2018-05-30 0:05 ` joelaf 2018-05-31 6:45 ` kbuild test robot 2018-05-31 6:45 ` kbuild test robot 2018-05-31 6:45 ` lkp 2018-05-31 6:45 ` [PATCH] kselftests: fix ptr_ret.cocci warnings kbuild test robot 2018-05-31 6:45 ` kbuild test robot 2018-05-31 6:45 ` fengguang.wu 2018-05-31 7:14 ` Joel Fernandes 2018-05-31 7:14 ` Joel Fernandes 2018-05-31 7:14 ` joel
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