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[JFFS2] Trigger garbage collection when very_dirty_list size becomes excessive 

With huge amounts of free space, we weren't bothering to GC for while a
while, and pathological numbers of obsolete nodes were accumulating,
seriously affecting performance on NAND flash (OLPC trac #3978)

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2007-10-06 15:12:58 -04:00
parent 49defc015f
commit 8fb870df5a
3 changed files with 24 additions and 2 deletions
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10
fs/jffs2/build.c
View File

@ -285,6 +285,14 @@ static void jffs2_calc_trigger_levels(struct jffs2_sb_info *c)
than actually making progress? */
c->resv_blocks_gcbad = 0;//c->resv_blocks_deletion + 2;
/* What number of 'very dirty' eraseblocks do we allow before we
trigger the GC thread even if we don't _need_ the space. When we
can't mark nodes obsolete on the medium, the old dirty nodes cause
performance problems because we have to inspect and discard them. */
c->vdirty_blocks_gctrigger = c->resv_blocks_gcmerge;
if (jffs2_can_mark_obsolete(c))
c->vdirty_blocks_gctrigger *= 10;
/* If there's less than this amount of dirty space, don't bother
trying to GC to make more space. It'll be a fruitless task */
c->nospc_dirty_size = c->sector_size + (c->flash_size / 100);
@ -303,6 +311,8 @@ static void jffs2_calc_trigger_levels(struct jffs2_sb_info *c)
c->resv_blocks_gcbad, c->resv_blocks_gcbad*c->sector_size/1024);
dbg_fsbuild("Amount of dirty space required to GC: %d bytes\n",
c->nospc_dirty_size);
dbg_fsbuild("Very dirty blocks before GC triggered: %d\n",
c->vdirty_blocks_gctrigger);
}
int jffs2_do_mount_fs(struct jffs2_sb_info *c)

2
fs/jffs2/jffs2_fs_sb.h
View File

@ -69,6 +69,8 @@ struct jffs2_sb_info {
uint8_t resv_blocks_gctrigger; /* ... wake up the GC thread */
uint8_t resv_blocks_gcbad; /* ... pick a block from the bad_list to GC */
uint8_t resv_blocks_gcmerge; /* ... merge pages when garbage collecting */
/* Number of 'very dirty' blocks before we trigger immediate GC */
uint8_t vdirty_blocks_gctrigger;
uint32_t nospc_dirty_size;

14
fs/jffs2/nodemgmt.c
View File

@ -722,6 +722,8 @@ int jffs2_thread_should_wake(struct jffs2_sb_info *c)
{
int ret = 0;
uint32_t dirty;
int nr_very_dirty = 0;
struct jffs2_eraseblock *jeb;
if (c->unchecked_size) {
D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): unchecked_size %d, checked_ino #%d\n",
@ -743,8 +745,16 @@ int jffs2_thread_should_wake(struct jffs2_sb_info *c)
(dirty > c->nospc_dirty_size))
ret = 1;
D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x: %s\n",
c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size, ret?"yes":"no"));
list_for_each_entry(jeb, &c->very_dirty_list, list) {
nr_very_dirty++;
if (nr_very_dirty == c->vdirty_blocks_gctrigger) {
ret = 1;
D1(break);
}
}
D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x, vdirty_blocks %d: %s\n",
c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size, nr_very_dirty, ret?"yes":"no"));
return ret;
}