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Thu, 10 Nov 2022 18:10:34 -0800 (PST) Date: Thu, 10 Nov 2022 18:10:32 -0800 From: Minchan Kim To: Sergey Senozhatsky Cc: Andrew Morton , Nitin Gupta , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCHv4 6/9] zsmalloc: pass limit on pages per-zspage to zs_create_pool() Message-ID: References: <20221031054108.541190-1-senozhatsky@chromium.org> <20221031054108.541190-7-senozhatsky@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221031054108.541190-7-senozhatsky@chromium.org> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668132635; a=rsa-sha256; cv=none; b=ui1zglpfyLjWmA27pCJAboNFBMlRZozbnmwVfwXCwYsHPO9ifKIHKSTbVU9njA7kWX7W2P bIT/2LD6YOMQz0kA46HwQjbq1ghNmBalLZjwnsro21JqoZh9SsVBH4B+RTWkFqyb6ddQ9X GdpPxvS2ov/lmuikQ9eE2+i70aQTH/s= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=aBm2wCxn; spf=pass (imf02.hostedemail.com: domain of minchan.kim@gmail.com designates 209.85.215.177 as permitted sender) smtp.mailfrom=minchan.kim@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1668132635; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=BeXSwUwF6AjEyAp6A6rHwWgKokXvJbdv3lBmf/aErhs=; b=n4IYLHdxVUt759URQ+6uKQD8AU9K3wMivo6K/0h3+p8XRUcOMy2F5BBnMuOJUjbkajeK0P 2ItOGFp70EYDhJ7oT5WHOdda2rw34ST82WhAn8dViwwrGv6slFZ/4ZOEE7Ko+l41PsQCtW hZfhh/Ca40hFfPc4/sMf1RSdSVLXuKs= Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=aBm2wCxn; spf=pass (imf02.hostedemail.com: domain of minchan.kim@gmail.com designates 209.85.215.177 as permitted sender) smtp.mailfrom=minchan.kim@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) X-Rspamd-Server: rspam12 X-Rspam-User: X-Stat-Signature: 79hhiqqdr6et7m5huxkp3oppghfcduo3 X-Rspamd-Queue-Id: ACE2280009 X-HE-Tag: 1668132635-70933 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: On Mon, Oct 31, 2022 at 02:41:05PM +0900, Sergey Senozhatsky wrote: > Allow zsmalloc pool owner to specify max number of pages > per-zspage (during pool creation), so that different pools > can have different characteristics. > > By default we pass ZS_DEFAULT_PAGES_PER_ZSPAGE which is 4 > (matches the current order 2 zspages limit). How could user decide what's the best size for their workload? > > Signed-off-by: Sergey Senozhatsky > --- > drivers/block/zram/zram_drv.c | 3 ++- > include/linux/zsmalloc.h | 2 +- > mm/zsmalloc.c | 11 +++++++---- > 3 files changed, 10 insertions(+), 6 deletions(-) > > diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c > index 90b0c66bbd5b..bec02f636bce 100644 > --- a/drivers/block/zram/zram_drv.c > +++ b/drivers/block/zram/zram_drv.c > @@ -1247,7 +1247,8 @@ static bool zram_meta_alloc(struct zram *zram, u64 disksize) > if (!zram->table) > return false; > > - zram->mem_pool = zs_create_pool(zram->disk->disk_name); > + zram->mem_pool = zs_create_pool(zram->disk->disk_name, > + ZS_DEFAULT_PAGES_PER_ZSPAGE); > if (!zram->mem_pool) { > vfree(zram->table); > return false; > diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h > index b6b8654a2d45..28f2b9cb1c47 100644 > --- a/include/linux/zsmalloc.h > +++ b/include/linux/zsmalloc.h > @@ -50,7 +50,7 @@ struct zs_pool_stats { > > struct zs_pool; > > -struct zs_pool *zs_create_pool(const char *name); > +struct zs_pool *zs_create_pool(const char *name, unsigned long num_pages); > void zs_destroy_pool(struct zs_pool *pool); > > unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); > diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c > index d329bd673baa..42987a913f45 100644 > --- a/mm/zsmalloc.c > +++ b/mm/zsmalloc.c > @@ -366,7 +366,7 @@ static void *zs_zpool_create(const char *name, gfp_t gfp, > * different contexts and its caller must provide a valid > * gfp mask. > */ > - return zs_create_pool(name); > + return zs_create_pool(name, ZS_DEFAULT_PAGES_PER_ZSPAGE); > } > > static void zs_zpool_destroy(void *pool) > @@ -2195,6 +2195,7 @@ static int zs_register_shrinker(struct zs_pool *pool) > /** > * zs_create_pool - Creates an allocation pool to work from. > * @name: pool name to be created > + * @num_pages: maximum number of pages per-zspage How about "max_page_chain:"? > * > * This function must be called before anything when using > * the zsmalloc allocator. > @@ -2202,18 +2203,20 @@ static int zs_register_shrinker(struct zs_pool *pool) > * On success, a pointer to the newly created pool is returned, > * otherwise NULL. > */ > -struct zs_pool *zs_create_pool(const char *name) > +struct zs_pool *zs_create_pool(const char *name, unsigned long num_pages) > { > int i; > struct zs_pool *pool; > struct size_class *prev_class = NULL; > - unsigned long num_pages; > + > + if (WARN_ON(num_pages < ZS_MIN_PAGES_PER_ZSPAGE || > + num_pages > ZS_MAX_PAGES_PER_ZSPAGE)) > + return NULL; > > pool = kzalloc(sizeof(*pool), GFP_KERNEL); > if (!pool) > return NULL; > > - num_pages = ZS_DEFAULT_PAGES_PER_ZSPAGE; > /* min_alloc_size must be multiple of ZS_ALIGN */ > pool->min_alloc_size = num_pages << PAGE_SHIFT >> OBJ_INDEX_BITS; > pool->min_alloc_size = max(pool->min_alloc_size, ZS_MIN_ALLOC_SIZE); > -- > 2.38.1.273.g43a17bfeac-goog >