The patch titled Subject: zsmalloc: add ops fields to zs_pool to store evict handlers has been added to the -mm mm-unstable branch. Its filename is zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Nhat Pham <nphamcs@xxxxxxxxx> Subject: zsmalloc: add ops fields to zs_pool to store evict handlers Date: Tue, 8 Nov 2022 11:32:06 -0800 This adds fields to zs_pool to store evict handlers for writeback, analogous to the zbud allocator. Link: https://lkml.kernel.org/r/20221108193207.3297327-5-nphamcs@xxxxxxxxx Signed-off-by: Nhat Pham <nphamcs@xxxxxxxxx> Cc: Dan Streetman <ddstreet@xxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: Nitin Gupta <ngupta@xxxxxxxxxx> Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> Cc: Seth Jennings <sjenning@xxxxxxxxxx> Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/zsmalloc.c | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) --- a/mm/zsmalloc.c~zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers +++ a/mm/zsmalloc.c @@ -213,6 +213,12 @@ struct link_free { }; }; +struct zs_pool; + +struct zs_ops { + int (*evict)(struct zs_pool *pool, unsigned long handle); +}; + struct zs_pool { const char *name; @@ -234,6 +240,12 @@ struct zs_pool { /* List tracking the zspages in LRU order by most recently added object */ struct list_head lru; +#ifdef CONFIG_ZPOOL + const struct zs_ops *ops; + struct zpool *zpool; + const struct zpool_ops *zpool_ops; +#endif + #ifdef CONFIG_ZSMALLOC_STAT struct dentry *stat_dentry; #endif @@ -371,6 +383,18 @@ static void record_obj(unsigned long han #ifdef CONFIG_ZPOOL +static int zs_zpool_evict(struct zs_pool *pool, unsigned long handle) +{ + if (pool->zpool && pool->zpool_ops && pool->zpool_ops->evict) + return pool->zpool_ops->evict(pool->zpool, handle); + else + return -ENOENT; +} + +static const struct zs_ops zs_zpool_ops = { + .evict = zs_zpool_evict +}; + static void *zs_zpool_create(const char *name, gfp_t gfp, const struct zpool_ops *zpool_ops, struct zpool *zpool) @@ -380,7 +404,20 @@ static void *zs_zpool_create(const char * different contexts and its caller must provide a valid * gfp mask. */ - return zs_create_pool(name, ZS_DEFAULT_PAGES_PER_ZSPAGE); + struct zs_pool *pool; + + pool = zs_create_pool(name, ZS_DEFAULT_PAGES_PER_ZSPAGE); + if (pool) { + pool->zpool = zpool; + pool->zpool_ops = zpool_ops; + + if (zpool_ops) + pool->ops = &zs_zpool_ops; + else + pool->ops = NULL; + } + + return pool; } static void zs_zpool_destroy(void *pool) _ Patches currently in -mm which might be from nphamcs@xxxxxxxxx are zsmalloc-consolidate-zs_pools-migrate_lock-and-size_classs-locks.patch zsmalloc-add-a-lru-to-zs_pool-to-keep-track-of-zspages-in-lru-order.patch zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch zsmalloc-implement-writeback-mechanism-for-zsmalloc.patch