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Date: Mon, 3 Aug 2015 16:27:05 +0800
From: Minfei Huang <mnfhuang@...il.com>
To: tj@...nel.org, rostedt@...dmis.org, mingo@...hat.com
Cc: linux-kernel@...r.kernel.org, mhuang@...hat.com,
Minfei Huang <mnfhuang@...il.com>
Subject: [PATCH] workqueue: Add the allocation flags to function schedule_on_each_cpu_gfp
Rename the function schedule_on_each_cpu to schedule_on_each_cpu_gfp to
add the allocation flags as parameter.
In several situation in ftrace, we are nervous and never come back, once
schedule_on_each_cpu fails to alloc the percpu work. Add the allocation
flags __GFP_NOFAIL to guarantee it.
Signed-off-by: Minfei Huang <mnfhuang@...il.com>
---
arch/x86/platform/uv/uv_time.c | 2 +-
include/linux/ftrace.h | 2 +-
include/linux/workqueue.h | 2 +-
kernel/trace/ftrace.c | 5 +++--
kernel/trace/trace_events.c | 2 +-
kernel/workqueue.c | 11 ++++++-----
6 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index a244237..a87a16a 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c
@@ -405,7 +405,7 @@ static __init int uv_rtc_setup_clock(void)
clock_event_device_uv.max_delta_ns = clocksource_uv.mask *
(NSEC_PER_SEC / sn_rtc_cycles_per_second);
- rc = schedule_on_each_cpu(uv_rtc_register_clockevents);
+ rc = schedule_on_each_cpu_gfp(uv_rtc_register_clockevents, GFP_KERNEL);
if (rc) {
x86_platform_ipi_callback = NULL;
uv_rtc_deallocate_timers();
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 6cd8c0e..d6d3cf5 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -154,7 +154,7 @@ struct ftrace_ops_hash {
*
* Any private data added must also take care not to be freed and if private
* data is added to a ftrace_ops that is in core code, the user of the
- * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
+ * ftrace_ops must perform a schedule_on_each_cpu_gfp() before freeing it.
*/
struct ftrace_ops {
ftrace_func_t func;
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 738b30b..2de50fe 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -436,7 +436,7 @@ extern bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
extern void flush_workqueue(struct workqueue_struct *wq);
extern void drain_workqueue(struct workqueue_struct *wq);
-extern int schedule_on_each_cpu(work_func_t func);
+extern int schedule_on_each_cpu_gfp(work_func_t func, gfp_t gfp);
int execute_in_process_context(work_func_t fn, struct execute_work *);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eb11011..f8d3111 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -324,7 +324,7 @@ static void update_ftrace_function(void)
* Make sure all CPUs see this. Yes this is slow, but static
* tracing is slow and nasty to have enabled.
*/
- schedule_on_each_cpu(ftrace_sync);
+ schedule_on_each_cpu_gfp(ftrace_sync, GFP_KERNEL | __GFP_NOFAIL);
/* Now all cpus are using the list ops. */
function_trace_op = set_function_trace_op;
/* Make sure the function_trace_op is visible on all CPUs */
@@ -2716,7 +2716,8 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
* ourselves.
*/
if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_CONTROL)) {
- schedule_on_each_cpu(ftrace_sync);
+ schedule_on_each_cpu_gfp(ftrace_sync,
+ GFP_KERNEL | __GFP_NOFAIL);
arch_ftrace_trampoline_free(ops);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 404a372..6cf0dba 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2722,7 +2722,7 @@ static __init int event_test_thread(void *unused)
if (!test_malloc)
pr_info("failed to kmalloc\n");
- schedule_on_each_cpu(test_work);
+ schedule_on_each_cpu_gfp(test_work, GFP_KERNEL);
kfree(test_malloc);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4c4f061..f7ef6bb 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2917,22 +2917,23 @@ bool cancel_delayed_work_sync(struct delayed_work *dwork)
EXPORT_SYMBOL(cancel_delayed_work_sync);
/**
- * schedule_on_each_cpu - execute a function synchronously on each online CPU
+ * schedule_on_each_cpu_gfp - execute function synchronously on each online CPU
* @func: the function to call
+ * @gfp: allocation flags
*
- * schedule_on_each_cpu() executes @func on each online CPU using the
+ * schedule_on_each_cpu_gfp() executes @func on each online CPU using the
* system workqueue and blocks until all CPUs have completed.
- * schedule_on_each_cpu() is very slow.
+ * schedule_on_each_cpu_gfp() is very slow.
*
* Return:
* 0 on success, -errno on failure.
*/
-int schedule_on_each_cpu(work_func_t func)
+int schedule_on_each_cpu_gfp(work_func_t func, gfp_t gfp)
{
int cpu;
struct work_struct __percpu *works;
- works = alloc_percpu(struct work_struct);
+ works = alloc_percpu_gfp(struct work_struct, gfp);
if (!works)
return -ENOMEM;
--
2.4.0
--
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