[XFS] Low memory allocation improvements (quietness and blockdev

congestion checks).

SGI-PV: 914873
SGI-Modid: xfs-linux:xfs-kern:20564a
Signed-off-by: Miquel van Smoorenburg <miquels@cistron.net>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/kmem.c

@@ -35,6 +35,7 @@
 #include <linux/vmalloc.h>
 #include <linux/highmem.h>
 #include <linux/swap.h>
+#include <linux/blkdev.h>
 
 #include "time.h"
 #include "kmem.h"
@@ -46,7 +47,8 @@
 void *
 kmem_alloc(size_t size, int flags)
 {
-	int	retries = 0, lflags = kmem_flags_convert(flags);
+	int	retries = 0;
+	int	lflags = kmem_flags_convert(flags);
 	void	*ptr;
 
 	do {
@@ -57,8 +59,10 @@ kmem_alloc(size_t size, int flags)
 		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
 			return ptr;
 		if (!(++retries % 100))
-			printk(KERN_ERR "possible deadlock in %s (mode:0x%x)\n",
+			printk(KERN_ERR "XFS: possible memory allocation "
+					"deadlock in %s (mode:0x%x)\n",
 					__FUNCTION__, lflags);
+		blk_congestion_wait(WRITE, HZ/50);
 	} while (1);
 }
 
@@ -102,7 +106,8 @@ kmem_realloc(void *ptr, size_t newsize, size_t oldsize, int flags)
 void *
 kmem_zone_alloc(kmem_zone_t *zone, int flags)
 {
-	int	retries = 0, lflags = kmem_flags_convert(flags);
+	int	retries = 0;
+	int	lflags = kmem_flags_convert(flags);
 	void	*ptr;
 
 	do {
@@ -110,8 +115,10 @@ kmem_zone_alloc(kmem_zone_t *zone, int flags)
 		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
 			return ptr;
 		if (!(++retries % 100))
-			printk(KERN_ERR "possible deadlock in %s (mode:0x%x)\n",
+			printk(KERN_ERR "XFS: possible memory allocation "
+					"deadlock in %s (mode:0x%x)\n",
 					__FUNCTION__, lflags);
+		blk_congestion_wait(WRITE, HZ/50);
 	} while (1);
 }
 

fs/xfs/linux-2.6/kmem.h

@@ -83,7 +83,7 @@ typedef unsigned long xfs_pflags_t;
 
 static __inline unsigned int kmem_flags_convert(int flags)
 {
-	int lflags;
+	int	lflags = __GFP_NOWARN;	/* we'll report problems, if need be */
 
 #ifdef DEBUG
 	if (unlikely(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL))) {

fs/xfs/linux-2.6/xfs_buf.c

@@ -53,13 +53,10 @@
 #include <linux/workqueue.h>
 #include <linux/suspend.h>
 #include <linux/percpu.h>
+#include <linux/blkdev.h>
 
 #include "xfs_linux.h"
 
-#ifndef GFP_READAHEAD
-#define GFP_READAHEAD	(__GFP_NOWARN|__GFP_NORETRY)
-#endif
-
 /*
  * File wide globals
  */
@@ -118,8 +115,8 @@ ktrace_t *pagebuf_trace_buf;
  */
 
 #define pb_to_gfp(flags) \
-	(((flags) & PBF_READ_AHEAD) ? GFP_READAHEAD : \
-	 ((flags) & PBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL)
+	((((flags) & PBF_READ_AHEAD) ? __GFP_NORETRY : \
+	  ((flags) & PBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN)
 
 #define pb_to_km(flags) \
 	 (((flags) & PBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP)
@@ -387,13 +384,13 @@ _pagebuf_lookup_pages(
 			 */
 			if (!(++retries % 100))
 				printk(KERN_ERR
-					"possible deadlock in %s (mode:0x%x)\n",
+					"XFS: possible memory allocation "
+					"deadlock in %s (mode:0x%x)\n",
 					__FUNCTION__, gfp_mask);
 
 			XFS_STATS_INC(pb_page_retries);
 			pagebuf_daemon_wakeup(0, gfp_mask);
-			set_current_state(TASK_UNINTERRUPTIBLE);
-			schedule_timeout(10);
+			blk_congestion_wait(WRITE, HZ/50);
 			goto retry;
 		}