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When doing that, for each pool of node, >>> the whole list is detached from the pool for handling. At this time, >>> that pool is empty. It's not necessary to update the pool size each time >>> when one VA is removed and addded into free vmap tree. >>> >>> Here change code to update the pool size when attaching the pool back. >>> >>> Signed-off-by: Baoquan He >>> --- >>> mm/vmalloc.c | 23 +++++++++++------------ >>> 1 file changed, 11 insertions(+), 12 deletions(-) >>> >>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c >>> index 488d69b56765..bf735c890878 100644 >>> --- a/mm/vmalloc.c >>> +++ b/mm/vmalloc.c >>> @@ -2150,7 +2150,7 @@ decay_va_pool_node(struct vmap_node *vn, bool full_decay) >>> LIST_HEAD(decay_list); >>> struct rb_root decay_root = RB_ROOT; >>> struct vmap_area *va, *nva; >>> - unsigned long n_decay; >>> + unsigned long n_decay, len; >>> int i; >>> >>> for (i = 0; i < MAX_VA_SIZE_PAGES; i++) { >>> @@ -2164,22 +2164,20 @@ decay_va_pool_node(struct vmap_node *vn, bool full_decay) >>> list_replace_init(&vn->pool[i].head, &tmp_list); >>> spin_unlock(&vn->pool_lock); >>> >>> - if (full_decay) >>> - WRITE_ONCE(vn->pool[i].len, 0); >>> + len = n_decay = vn->pool[i].len; >>> + WRITE_ONCE(vn->pool[i].len, 0); >>> >>> /* Decay a pool by ~25% out of left objects. */ >>> - n_decay = vn->pool[i].len >> 2; >>> + if (!full_decay) >>> + n_decay >>= 2; >>> + len -= n_decay; >>> >>> list_for_each_entry_safe(va, nva, &tmp_list, list) { >>> + if (!n_decay) >>> + break; >>> list_del_init(&va->list); >>> merge_or_add_vmap_area(va, &decay_root, &decay_list); >>> - >>> - if (!full_decay) { >>> - WRITE_ONCE(vn->pool[i].len, vn->pool[i].len - 1); >>> - >>> - if (!--n_decay) >>> - break; >>> - } >>> + n_decay--; >>> } >>> >>> /* >>> @@ -2188,9 +2186,10 @@ decay_va_pool_node(struct vmap_node *vn, bool full_decay) >>> * can populate the pool therefore a simple list replace >>> * operation takes place here. >>> */ >>> - if (!full_decay && !list_empty(&tmp_list)) { >>> + if (!list_empty(&tmp_list)) { >>> spin_lock(&vn->pool_lock); >>> list_replace_init(&tmp_list, &vn->pool[i].head); >>> + vn->pool[i].len = len; >> >> Current logic uses WRITE_ONCE() to update vn->pool[i].len. >> Could this lead to consistency issues? > > Seems no necessary to use WRITE_ONCE(). I can change back to use > WRITE_ONCE() just in case. Currently, it's only updated in > node_alloc(), decay_va_pool_node(), purge_vmap_node(). And the latter > two are inside vmap_purge_lock area. > Okay. Reviewed-by: Shivank Garg Tested-by: Shivank Garg Best, Shivank >> >>> spin_unlock(&vn->pool_lock); >>> } >>> } >> >