yaffs: More background gc tweaks.

[yaffs2.git] / yaffs_fs.c

diff --git a/yaffs_fs.c b/yaffs_fs.c
index ca02d468266b7ebbd1d76a7bce82e3ec4abb9033..25d3d2260fa4b36d1409b8f302ebebb303d5a09e 100644 (file)
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -1944,9 +1944,15 @@ static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
 {
        unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
        struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+       unsigned scatteredFree = 0; /* Free chunks not in an erased block */
+
+       if(erasedChunks < dev->nFreeChunks)
+               scatteredFree = (dev->nFreeChunks - erasedChunks);
 
        if(!context->bgRunning)
                return 0;
+       else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
+               return 0;
        else if(erasedChunks > dev->nFreeChunks/2)
                return 0;
        else if(erasedChunks > dev->nFreeChunks/4)
@@ -1961,27 +1967,28 @@ static int yaffs_do_sync_fs(struct super_block *sb,
 
        yaffs_Device *dev = yaffs_SuperToDevice(sb);
        unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+       unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+       int do_checkpoint;
 
-       if(!oneshot_checkpoint &&
-               yaffs_bg_gc_urgency(dev) > 0)
-               request_checkpoint = 0;
-
-       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, 
-               ("yaffs_do_sync_fs: %s %s%s\n",
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+               ("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n",
+               gc_urgent,
                sb->s_dirt ? "dirty" : "clean",
                request_checkpoint ? "checkpoint requested" : "no checkpoint",
                oneshot_checkpoint ? " one-shot" : "" ));
 
-       if (sb->s_dirt || oneshot_checkpoint) {
-               yaffs_GrossLock(dev);
-               yaffs_FlushSuperBlock(sb, request_checkpoint || oneshot_checkpoint);
-               yaffs_GrossUnlock(dev);
+       yaffs_GrossLock(dev);
+       do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+                       oneshot_checkpoint) &&
+                       !dev->isCheckpointed;
 
+       if (sb->s_dirt || do_checkpoint) {
+               yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
                sb->s_dirt = 0;
-
                if(oneshot_checkpoint)
                        yaffs_auto_checkpoint &= ~4;
        }
+       yaffs_GrossUnlock(dev);
 
        return 0;
 }
@@ -2038,22 +2045,26 @@ static int yaffs_BackgroundThread(void *data)
 
                now = jiffies;
 
-               if(time_after(now, next_dir_update) &&
-                       !dev->isCheckpointed){
+               if(time_after(now, next_dir_update)){
                        yaffs_UpdateDirtyDirectories(dev);
                        next_dir_update = now + HZ;
                }
 
-               if(time_after(now,next_gc) &&
-                       ! dev->isCheckpointed){
-                       gcResult = yaffs_BackgroundGarbageCollect(dev);
-                       urgency = yaffs_bg_gc_urgency(dev);
-                       if(urgency > 1)
-                               next_gc = now + HZ/50+1;
-                       else if(urgency > 0)
-                               next_gc = now + HZ/20+1;
-                       else
-                               next_gc = now + HZ * 2;
+               if(time_after(now,next_gc)){
+                       if(!dev->isCheckpointed){
+                               urgency = yaffs_bg_gc_urgency(dev);
+                               gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
+                               if(urgency > 1)
+                                       next_gc = now + HZ/20+1;
+                               else if(urgency > 0)
+                                       next_gc = now + HZ/10+1;
+                               else
+                                       next_gc = now + HZ * 2;
+                       } else /*
+                               * gc not running so set to next_dir_update
+                               * to cut down on wake ups
+                               */
+                               next_gc = next_dir_update;
                }
                yaffs_GrossUnlock(dev);
 #if 1
@@ -2134,7 +2145,7 @@ static int yaffs_write_super(struct super_block *sb)
 {
        unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
 
-       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
                ("yaffs_write_super%s\n",
                request_checkpoint ? " checkpt" : ""));
 
@@ -2898,8 +2909,10 @@ static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
        buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
        buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
        buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
-       buf += sprintf(buf, "garbageCollections. %u\n", dev->garbageCollections);
-       buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGarbageCollections);
+       buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
+       buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
+       buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+       buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
        buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
        buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
        buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
@@ -2992,8 +3005,9 @@ static int yaffs_debug_proc_read(char *page,
                nTnodes = dev->nTnodesCreated - dev->nFreeTnodes;
                
                
-               buf += sprintf(buf,"%d, %d, %d, %d, %d\n", 
+               buf += sprintf(buf,"%d, %d, %d, %u, %u, %d, %d\n",
                                n, dev->nFreeChunks, erasedChunks,
+                               dev->backgroundGCs, dev->oldestDirtyGCs,
                                nObjects, nTnodes);
        }
        up(&yaffs_context_lock);