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Date: Tue, 7 Apr 2009 09:07:25 GMT
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: generalize pending infrastructure
Commit-ID: 671dec5daf3b3c43c5777be282f00120a44cf37f
Gitweb: http://git.kernel.org/tip/671dec5daf3b3c43c5777be282f00120a44cf37f
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Mon, 6 Apr 2009 11:45:02 +0200
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 7 Apr 2009 10:48:55 +0200
perf_counter: generalize pending infrastructure
Prepare the pending infrastructure to do more than wakeups.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
LKML-Reference: <20090406094517.634732847@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
include/linux/perf_counter.h | 7 +++--
kernel/perf_counter.c | 53 +++++++++++++++++++++++++----------------
2 files changed, 36 insertions(+), 24 deletions(-)
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 8d5d11b..977fb15 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -321,8 +321,9 @@ struct perf_mmap_data {
void *data_pages[0];
};
-struct perf_wakeup_entry {
- struct perf_wakeup_entry *next;
+struct perf_pending_entry {
+ struct perf_pending_entry *next;
+ void (*func)(struct perf_pending_entry *);
};
/**
@@ -401,7 +402,7 @@ struct perf_counter {
wait_queue_head_t waitq;
struct fasync_struct *fasync;
/* optional: for NMIs */
- struct perf_wakeup_entry wakeup;
+ struct perf_pending_entry pending;
void (*destroy)(struct perf_counter *);
struct rcu_head rcu_head;
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index c58cc64..0a2ade2 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1581,6 +1581,14 @@ void perf_counter_wakeup(struct perf_counter *counter)
kill_fasync(&counter->fasync, SIGIO, POLL_IN);
}
+static void perf_pending_wakeup(struct perf_pending_entry *entry)
+{
+ struct perf_counter *counter = container_of(entry,
+ struct perf_counter, pending);
+
+ perf_counter_wakeup(counter);
+}
+
/*
* Pending wakeups
*
@@ -1590,45 +1598,47 @@ void perf_counter_wakeup(struct perf_counter *counter)
* single linked list and use cmpxchg() to add entries lockless.
*/
-#define PENDING_TAIL ((struct perf_wakeup_entry *)-1UL)
+#define PENDING_TAIL ((struct perf_pending_entry *)-1UL)
-static DEFINE_PER_CPU(struct perf_wakeup_entry *, perf_wakeup_head) = {
+static DEFINE_PER_CPU(struct perf_pending_entry *, perf_pending_head) = {
PENDING_TAIL,
};
-static void perf_pending_queue(struct perf_counter *counter)
+static void perf_pending_queue(struct perf_pending_entry *entry,
+ void (*func)(struct perf_pending_entry *))
{
- struct perf_wakeup_entry **head;
- struct perf_wakeup_entry *prev, *next;
+ struct perf_pending_entry **head;
- if (cmpxchg(&counter->wakeup.next, NULL, PENDING_TAIL) != NULL)
+ if (cmpxchg(&entry->next, NULL, PENDING_TAIL) != NULL)
return;
- head = &get_cpu_var(perf_wakeup_head);
+ entry->func = func;
+
+ head = &get_cpu_var(perf_pending_head);
do {
- prev = counter->wakeup.next = *head;
- next = &counter->wakeup;
- } while (cmpxchg(head, prev, next) != prev);
+ entry->next = *head;
+ } while (cmpxchg(head, entry->next, entry) != entry->next);
set_perf_counter_pending();
- put_cpu_var(perf_wakeup_head);
+ put_cpu_var(perf_pending_head);
}
static int __perf_pending_run(void)
{
- struct perf_wakeup_entry *list;
+ struct perf_pending_entry *list;
int nr = 0;
- list = xchg(&__get_cpu_var(perf_wakeup_head), PENDING_TAIL);
+ list = xchg(&__get_cpu_var(perf_pending_head), PENDING_TAIL);
while (list != PENDING_TAIL) {
- struct perf_counter *counter = container_of(list,
- struct perf_counter, wakeup);
+ void (*func)(struct perf_pending_entry *);
+ struct perf_pending_entry *entry = list;
list = list->next;
- counter->wakeup.next = NULL;
+ func = entry->func;
+ entry->next = NULL;
/*
* Ensure we observe the unqueue before we issue the wakeup,
* so that we won't be waiting forever.
@@ -1636,7 +1646,7 @@ static int __perf_pending_run(void)
*/
smp_wmb();
- perf_counter_wakeup(counter);
+ func(entry);
nr++;
}
@@ -1658,7 +1668,7 @@ static inline int perf_not_pending(struct perf_counter *counter)
* so that we do not miss the wakeup. -- see perf_pending_handle()
*/
smp_rmb();
- return counter->wakeup.next == NULL;
+ return counter->pending.next == NULL;
}
static void perf_pending_sync(struct perf_counter *counter)
@@ -1695,9 +1705,10 @@ struct perf_output_handle {
static inline void __perf_output_wakeup(struct perf_output_handle *handle)
{
- if (handle->nmi)
- perf_pending_queue(handle->counter);
- else
+ if (handle->nmi) {
+ perf_pending_queue(&handle->counter->pending,
+ perf_pending_wakeup);
+ } else
perf_counter_wakeup(handle->counter);
}
--
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