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[JFFS2] Trigger garbage collection when very_dirty_list size becomes excessive

Bläddra i källkod 
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
förälder 49defc015f
incheckning 8fb870df5a
3 ändrade filer med 24 tillägg och 2 borttagningar
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14
fs/jffs2/nodemgmt.c
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@@ -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;
}