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otMp/5EXhmWmzEi7HbZ8bBvRKF2pd8mCUejYfjgjDZrKVe/nxZA4QcVkrsZjj3FtscAsQzHQ7fKt8a2yS3oKYzSZr16nkIl6WXdCTyJoRDI3BeL/DWAVuPavzoAahTTAuwgBpRLoBPnONHHSWliD+Nr13LOhvJGVSiT5gA416agPaRVBrwwqaPYa6bjZjYH5Ylv/gXTf39sF6LX9cBqkB/s+42gHCd3JS76D8ZUgzgkO+6/c5HY8YuVD2zVFelS3ebvf0RZWQZ3o/ws2fcjprzkUyzxDi61Bp/c/XnULgumHlAdheiMLgTOglWCdGiiUAHOtzfkp1EgQAgWwTOUOyz0Qt4W8vbpawE4Trr9r+tzkXU89KeNBzmIhQuTg8XRvKwBfR4BxE8q21DHgflZjC9Ps5eC9u3dotSENOCtcny4c8mcwFWdlfsLJ4e+Uj3Pjxs7fhI/6XuzvwLVX9sxl0E7DPljYUJFTPYZyP X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/15/2025 8:09 AM, Baoquan He wrote: > When purge lazily freed vmap areas, VA stored in vn->pool[] will also be > taken away into free vmap tree partially or completely accordingly, that > is done in decay_va_pool_node(). 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? > spin_unlock(&vn->pool_lock); > } > }