From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id 15DB96B0038 for ; Wed, 28 Jan 2015 09:18:44 -0500 (EST) Received: by mail-pa0-f47.google.com with SMTP id lj1so25783439pab.6 for ; Wed, 28 Jan 2015 06:18:43 -0800 (PST) Received: from mail-pd0-x22b.google.com (mail-pd0-x22b.google.com. [2607:f8b0:400e:c02::22b]) by mx.google.com with ESMTPS id kp11si5974126pab.94.2015.01.28.06.18.42 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 28 Jan 2015 06:18:43 -0800 (PST) Received: by mail-pd0-f171.google.com with SMTP id fp1so25955893pdb.2 for ; Wed, 28 Jan 2015 06:18:42 -0800 (PST) Date: Wed, 28 Jan 2015 23:19:17 +0900 From: Sergey Senozhatsky Subject: Re: [PATCH 1/2] zram: free meta table in zram_meta_free Message-ID: <20150128141916.GA14062@swordfish> References: <1422432945-6764-1-git-send-email-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1422432945-6764-1-git-send-email-minchan@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Nitin Gupta , Jerome Marchand , Sergey Senozhatsky , Ganesh Mahendran , sergey.senozhatsky.work@gmail.com On (01/28/15 17:15), Minchan Kim wrote: > zram_meta_alloc() and zram_meta_free() are a pair. > In zram_meta_alloc(), meta table is allocated. So it it better to free > it in zram_meta_free(). > > Signed-off-by: Ganesh Mahendran > Signed-off-by: Minchan Kim > --- > drivers/block/zram/zram_drv.c | 30 ++++++++++++++---------------- > drivers/block/zram/zram_drv.h | 1 + > 2 files changed, 15 insertions(+), 16 deletions(-) > > diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c > index 9250b3f54a8f..a598ada817f0 100644 > --- a/drivers/block/zram/zram_drv.c > +++ b/drivers/block/zram/zram_drv.c > @@ -309,6 +309,18 @@ static inline int valid_io_request(struct zram *zram, > > static void zram_meta_free(struct zram_meta *meta) > { > + size_t index; I don't like how we bloat structs w/o any need. zram keeps ->disksize, so let's use `zram->disksize >> PAGE_SHIFT' instead of introducing ->num_pages. -ss > + /* Free all pages that are still in this zram device */ > + for (index = 0; index < meta->num_pages; index++) { > + unsigned long handle = meta->table[index].handle; > + > + if (!handle) > + continue; > + > + zs_free(meta->mem_pool, handle); > + } > + > zs_destroy_pool(meta->mem_pool); > vfree(meta->table); > kfree(meta); > @@ -316,15 +328,14 @@ static void zram_meta_free(struct zram_meta *meta) > > static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize) > { > - size_t num_pages; > char pool_name[8]; > struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL); > > if (!meta) > return NULL; > > - num_pages = disksize >> PAGE_SHIFT; > - meta->table = vzalloc(num_pages * sizeof(*meta->table)); > + meta->num_pages = disksize >> PAGE_SHIFT; > + meta->table = vzalloc(meta->num_pages * sizeof(*meta->table)); > if (!meta->table) { > pr_err("Error allocating zram address table\n"); > goto out_error; > @@ -706,9 +717,6 @@ static void zram_bio_discard(struct zram *zram, u32 index, > > static void zram_reset_device(struct zram *zram, bool reset_capacity) > { > - size_t index; > - struct zram_meta *meta; > - > down_write(&zram->init_lock); > > zram->limit_pages = 0; > @@ -718,16 +726,6 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity) > return; > } > > - meta = zram->meta; > - /* Free all pages that are still in this zram device */ > - for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) { > - unsigned long handle = meta->table[index].handle; > - if (!handle) > - continue; > - > - zs_free(meta->mem_pool, handle); > - } > - > zcomp_destroy(zram->comp); > zram->max_comp_streams = 1; > > diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h > index b05a816b09ac..e492f6bf11f1 100644 > --- a/drivers/block/zram/zram_drv.h > +++ b/drivers/block/zram/zram_drv.h > @@ -96,6 +96,7 @@ struct zram_stats { > struct zram_meta { > struct zram_table_entry *table; > struct zs_pool *mem_pool; > + size_t num_pages; > }; > > struct zram { > -- > 1.9.1 > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org