On 2024/4/5 13:35, Yosry Ahmed wrote:
> Refactor limit and acceptance threshold checking outside of
> zswap_store(). This code will be moved around in a following patch, so
> it would be cleaner to move a function call around.
>
> Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
LGTM.
Reviewed-by: Chengming Zhou <chengming.zhou@xxxxxxxxx>
Thanks.
> ---
> mm/zswap.c | 29 +++++++++++++++--------------
> 1 file changed, 15 insertions(+), 14 deletions(-)
>
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 832e3f56232f0..ab3cd43cdfc9d 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -1444,6 +1444,20 @@ static void zswap_fill_page(void *ptr, unsigned long value)
> memset_l(page, value, PAGE_SIZE / sizeof(unsigned long));
> }
>
> +static bool zswap_check_full(void)
> +{
> + unsigned long cur_pages = zswap_total_pages();
> +
> + if (cur_pages >= READ_ONCE(zswap_max_pages)) {
> + zswap_pool_limit_hit++;
> + zswap_pool_reached_full = true;
> + } else if (zswap_pool_reached_full &&
> + cur_pages <= READ_ONCE(zswap_accept_thr_pages)) {
> + zswap_pool_reached_full = false;
> + }
> + return zswap_pool_reached_full;
> +}
> +
> bool zswap_store(struct folio *folio)
> {
> swp_entry_t swp = folio->swap;
> @@ -1452,7 +1466,6 @@ bool zswap_store(struct folio *folio)
> struct zswap_entry *entry, *old;
> struct obj_cgroup *objcg = NULL;
> struct mem_cgroup *memcg = NULL;
> - unsigned long max_pages, cur_pages;
>
> VM_WARN_ON_ONCE(!folio_test_locked(folio));
> VM_WARN_ON_ONCE(!folio_test_swapcache(folio));
> @@ -1475,20 +1488,8 @@ bool zswap_store(struct folio *folio)
> mem_cgroup_put(memcg);
> }
>
> - /* Check global limits */
> - cur_pages = zswap_total_pages();
> - if (cur_pages >= READ_ONCE(zswap_max_pages)) {
> - zswap_pool_limit_hit++;
> - zswap_pool_reached_full = true;
> + if (zswap_check_full())
> goto reject;
> - }
> -
> - if (zswap_pool_reached_full) {
> - if (cur_pages > READ_ONCE(zswap_accept_thr_pages))
> - goto reject;
> - else
> - zswap_pool_reached_full = false;
> - }
>
> /* allocate entry */
> entry = zswap_entry_cache_alloc(GFP_KERNEL, folio_nid(folio));
