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UBI: Fastmap: Make ubi_refill_pools() fair 

Currently ubi_refill_pools() first fills the first and then
the second one.
If only very few free PEBs are available the second pool can get
zero PEBs.
Change ubi_refill_pools() to distribute free PEBs fair between
all pools.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Guido Martínez <guido@vanguardiasur.com.ar>
This commit is contained in:
Richard Weinberger 2014-11-10 15:39:17 +01:00
parent 691a870563
commit 6830356466
1 changed files with 57 additions and 48 deletions
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105
drivers/mtd/ubi/wl.c
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@ -579,60 +579,63 @@ static void return_unused_pool_pebs(struct ubi_device *ubi,
}
}
/**
* refill_wl_pool - refills all the fastmap pool used by the
* WL sub-system.
* @ubi: UBI device description object
*/
static void refill_wl_pool(struct ubi_device *ubi)
{
struct ubi_wl_entry *e;
struct ubi_fm_pool *pool = &ubi->fm_wl_pool;
return_unused_pool_pebs(ubi, pool);
for (pool->size = 0; pool->size < pool->max_size; pool->size++) {
if (!ubi->free.rb_node ||
(ubi->free_count - ubi->beb_rsvd_pebs < 5))
break;
e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
self_check_in_wl_tree(ubi, e, &ubi->free);
rb_erase(&e->u.rb, &ubi->free);
ubi->free_count--;
pool->pebs[pool->size] = e->pnum;
}
pool->used = 0;
}
/**
* refill_wl_user_pool - refills all the fastmap pool used by ubi_wl_get_peb.
* @ubi: UBI device description object
*/
static void refill_wl_user_pool(struct ubi_device *ubi)
{
struct ubi_fm_pool *pool = &ubi->fm_pool;
return_unused_pool_pebs(ubi, pool);
for (pool->size = 0; pool->size < pool->max_size; pool->size++) {
pool->pebs[pool->size] = __wl_get_peb(ubi);
if (pool->pebs[pool->size] < 0)
break;
}
pool->used = 0;
}
/**
* ubi_refill_pools - refills all fastmap PEB pools.
* @ubi: UBI device description object
*/
void ubi_refill_pools(struct ubi_device *ubi)
{
struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;
struct ubi_fm_pool *pool = &ubi->fm_pool;
struct ubi_wl_entry *e;
int enough;
spin_lock(&ubi->wl_lock);
refill_wl_pool(ubi);
refill_wl_user_pool(ubi);
return_unused_pool_pebs(ubi, wl_pool);
return_unused_pool_pebs(ubi, pool);
wl_pool->size = 0;
pool->size = 0;
for (;;) {
enough = 0;
if (pool->size < pool->max_size) {
if (!ubi->free.rb_node ||
(ubi->free_count - ubi->beb_rsvd_pebs < 5))
break;
e = wl_get_wle(ubi);
if (!e)
break;
pool->pebs[pool->size] = e->pnum;
pool->size++;
} else
enough++;
if (wl_pool->size < wl_pool->max_size) {
if (!ubi->free.rb_node ||
(ubi->free_count - ubi->beb_rsvd_pebs < 5))
break;
e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
self_check_in_wl_tree(ubi, e, &ubi->free);
rb_erase(&e->u.rb, &ubi->free);
ubi->free_count--;
wl_pool->pebs[wl_pool->size] = e->pnum;
wl_pool->size++;
} else
enough++;
if (enough == 2)
break;
}
wl_pool->used = 0;
pool->used = 0;
spin_unlock(&ubi->wl_lock);
}
@ -2002,9 +2005,15 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
dbg_wl("found %i PEBs", found_pebs);
if (ubi->fm)
if (ubi->fm) {
ubi_assert(ubi->good_peb_count == \
found_pebs + ubi->fm->used_blocks);
for (i = 0; i < ubi->fm->used_blocks; i++) {
e = ubi->fm->e[i];
ubi->lookuptbl[e->pnum] = e;
}
}
else
ubi_assert(ubi->good_peb_count == found_pebs);