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From: Robert Richter <robert.richter@amd.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: oprofile-list <oprofile-list@lists.sourceforge.net>,
	Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
	Robert Richter <robert.richter@amd.com>
Subject: [PATCH 2/9] oprofile: adding cpu_buffer_write_commit()
Date: Thu, 11 Dec 2008 17:41:56 +0100	[thread overview]
Message-ID: <1229013723-8191-3-git-send-email-robert.richter@amd.com> (raw)
In-Reply-To: <1229013723-8191-1-git-send-email-robert.richter@amd.com>

This is in preparation for changes in the cpu buffer implementation.

Signed-off-by: Robert Richter <robert.richter@amd.com>
---
 drivers/oprofile/cpu_buffer.c |   18 +-----------------
 drivers/oprofile/cpu_buffer.h |   17 +++++++++++++++++
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 7e5e650..d6f5de6 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -148,22 +148,6 @@ static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
 	return tail + (b->buffer_size - head) - 1;
 }
 
-static void increment_head(struct oprofile_cpu_buffer *b)
-{
-	unsigned long new_head = b->head_pos + 1;
-
-	/*
-	 * Ensure anything written to the slot before we increment is
-	 * visible
-	 */
-	wmb();
-
-	if (new_head < b->buffer_size)
-		b->head_pos = new_head;
-	else
-		b->head_pos = 0;
-}
-
 static inline void
 add_sample(struct oprofile_cpu_buffer *cpu_buf,
 	   unsigned long pc, unsigned long event)
@@ -171,7 +155,7 @@ add_sample(struct oprofile_cpu_buffer *cpu_buf,
 	struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);
 	entry->eip = pc;
 	entry->event = event;
-	increment_head(cpu_buf);
+	cpu_buffer_write_commit(cpu_buf);
 }
 
 static inline void
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 0870699..e608976 100644
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -59,6 +59,23 @@ struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
 }
 
 static inline
+void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)
+{
+	unsigned long new_head = b->head_pos + 1;
+
+	/*
+	 * Ensure anything written to the slot before we increment is
+	 * visible
+	 */
+	wmb();
+
+	if (new_head < b->buffer_size)
+		b->head_pos = new_head;
+	else
+		b->head_pos = 0;
+}
+
+static inline
 struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
 {
 	return &cpu_buf->buffer[cpu_buf->tail_pos];
-- 
1.6.0.1



  parent reply	other threads:[~2008-12-11 16:53 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-11 16:41 [PATCH 0/9] oprofile: port to the new ring buffer Robert Richter
2008-12-11 16:41 ` [PATCH 1/9] oprofile: adding cpu buffer r/w access functions Robert Richter
2008-12-11 16:41 ` Robert Richter [this message]
2008-12-11 16:41 ` [PATCH 3/9] oprofile: adding cpu_buffer_entries() Robert Richter
2008-12-11 16:41 ` [PATCH 4/9] oprofile: moving cpu_buffer_reset() to cpu_buffer.h Robert Richter
2008-12-11 16:41 ` [PATCH 5/9] ring_buffer: add remaining cpu functions to ring_buffer.h Robert Richter
2008-12-11 19:23   ` Steven Rostedt
2008-12-11 16:42 ` [PATCH 6/9] oprofile: port to the new ring_buffer Robert Richter
2008-12-11 19:48   ` Steven Rostedt
2008-12-16 17:23     ` Robert Richter
2008-12-16 19:38       ` Steven Rostedt
2008-12-16  9:37   ` Andrew Morton
2008-12-11 16:42 ` [PATCH 7/9] oprofile: remove nr_available_slots() Robert Richter
2008-12-11 16:42 ` [PATCH 8/9] oprofile: fix lost sample counter Robert Richter
2008-12-11 16:42 ` [PATCH 9/9] ring_buffer: adding EXPORT_SYMBOLs Robert Richter
2008-12-11 17:19 ` [PATCH 0/9] oprofile: port to the new ring buffer Steven Rostedt
2008-12-12  5:57 ` Ingo Molnar
2008-12-16 23:49 ` Andrew Morton
2008-12-17  5:03   ` Pekka Enberg
2008-12-22 23:53 ` Carl Love

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