linux-kernel - [RFC PATCH 15/21] Add relay_add

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Date:	Thu, 16 Oct 2008 01:06:31 -0500
From:	Tom Zanussi <zanussi@...cast.net>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Steven Rostedt <rostedt@...dmis.org>, od@...e.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, hch@....de,
	David Wilder <dwilder@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: [RFC PATCH 15/21]  Add relay_add_pages

---
 include/linux/relay.h |   11 +++++++--
 kernel/relay.c        |   50 +++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 54 insertions(+), 7 deletions(-)

diff --git a/include/linux/relay.h b/include/linux/relay.h
index b23ba90..a33b728 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -19,6 +19,7 @@
 #include <linux/fs.h>
 #include <linux/poll.h>
 #include <linux/kref.h>
+#include <linux/pagevec.h>
 
 /*
  * relay channel flags
@@ -164,13 +165,17 @@ extern struct rchan *relay_open(const char *base_filename,
 				struct rchan_callbacks *cb,
 				void *private_data,
 				unsigned long rchan_flags);
-extern void relay_close(struct rchan *chan);
-extern void relay_flush(struct rchan *chan);
-extern void relay_reset(struct rchan *chan);
 extern void relay_add_page(struct rchan *chan,
 			   struct page *page,
 			   struct relay_page_callbacks *cb,
 			   void *private_data);
+extern void relay_add_pages(struct rchan *chan,
+			    struct pagevec *pages,
+			    struct relay_page_callbacks *cb,
+			    void *private_data);
+extern void relay_flush(struct rchan *chan);
+extern void relay_close(struct rchan *chan);
+extern void relay_reset(struct rchan *chan);
 
 extern int relay_late_setup_files(struct rchan *chan,
 				  const char *base_filename,
diff --git a/kernel/relay.c b/kernel/relay.c
index e53e729..b27b655 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -19,7 +19,6 @@
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/relay.h>
-#include <linux/vmalloc.h>
 #include <linux/mm.h>
 #include <linux/cpu.h>
 #include <linux/splice.h>
@@ -117,6 +116,14 @@ static inline void relay_wakeup_readers(struct rchan_buf *buf)
 		__mod_timer(&buf->timer, jiffies + 1);
 }
 
+static inline void __relay_add_page_nolock(struct rchan_buf *buf,
+					   struct relay_page *rpage)
+{
+	list_add_tail(&rpage->list, &buf->pages);
+	buf->nr_pages++;
+	relay_update_filesize(buf, PAGE_SIZE);
+}
+
 /**
  *	__relay_add_page - add a relay page to relay
  *	@buf: the buffer struct
@@ -127,9 +134,7 @@ static void __relay_add_page(struct rchan_buf *buf, struct relay_page *rpage)
 	unsigned long flags;
 
 	spin_lock_irqsave(&buf->lock, flags);
-	list_add_tail(&rpage->list, &buf->pages);
-	buf->nr_pages++;
-	relay_update_filesize(buf, PAGE_SIZE);
+	__relay_add_page_nolock(buf, rpage);
 	spin_unlock_irqrestore(&buf->lock, flags);
 
 	relay_wakeup_readers(buf);
@@ -165,6 +170,43 @@ void relay_add_page(struct rchan *chan,
 EXPORT_SYMBOL_GPL(relay_add_page);
 
 /**
+ *	relay_add_pages - add pages to relay
+ *	@buf: the buffer struct
+ *	@page: struct page
+ *
+ *	relay now owns the page.
+ */
+void relay_add_pages(struct rchan *chan,
+		     struct pagevec *pages,
+		     struct relay_page_callbacks *cb,
+		     void *private_data)
+{
+	struct relay_page *rpage;
+	struct rchan_buf *buf;
+	unsigned long flags;
+	int i, nr_pages = pagevec_count(pages);
+
+	buf = chan->buf[get_cpu()];
+	spin_lock_irqsave(&buf->lock, flags);
+	for (i = 0; i < nr_pages; i++) {
+		rpage = __relay_get_rpage(buf);
+
+		if (likely(rpage)) {
+			rpage->page = pages->pages[i];
+			set_page_private(rpage->page, (unsigned long)buf);
+			rpage->cb = cb;
+			rpage->private_data = private_data;
+			__relay_add_page_nolock(buf, rpage);
+		}
+	}
+	spin_unlock_irqrestore(&buf->lock, flags);
+	put_cpu();
+
+	relay_wakeup_readers(buf);
+}
+EXPORT_SYMBOL_GPL(relay_add_pages);
+
+/**
  *	relay_create_buf - allocate and initialize a channel buffer
  *	@chan: the relay channel
  *
-- 
1.5.3.5



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