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From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>,
	Kent Overstreet <kent.overstreet@gmail.com>,
	Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH 9/9] bcache: use kvmalloc
Date: Mon,  6 Mar 2017 11:33:27 +0100
Message-ID: <20170306103327.2766-5-mhocko@kernel.org> (raw)
In-Reply-To: <20170306103327.2766-1-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

bcache_device_init uses kmalloc for small requests and vmalloc for those
which are larger than 64 pages. This alone is a strange criterion.
Moreover kmalloc can fallback to vmalloc on the failure. Let's simply
use kvmalloc instead as it knows how to handle the fallback properly

Cc: Kent Overstreet <kent.overstreet@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 drivers/md/bcache/super.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 85e3f21c2514..e57353e39168 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -767,16 +767,12 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
 	}
 
 	n = d->nr_stripes * sizeof(atomic_t);
-	d->stripe_sectors_dirty = n < PAGE_SIZE << 6
-		? kzalloc(n, GFP_KERNEL)
-		: vzalloc(n);
+	d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL);
 	if (!d->stripe_sectors_dirty)
 		return -ENOMEM;
 
 	n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long);
-	d->full_dirty_stripes = n < PAGE_SIZE << 6
-		? kzalloc(n, GFP_KERNEL)
-		: vzalloc(n);
+	d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL);
 	if (!d->full_dirty_stripes)
 		return -ENOMEM;
 
-- 
2.11.0

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      parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-06 10:30 [PATCH 0/6 v5] kvmalloc Michal Hocko
2017-03-06 10:30 ` [PATCH 1/9] mm: introduce kv[mz]alloc helpers Michal Hocko
2017-06-02  7:17   ` Levin, Alexander (Sasha Levin)
2017-06-02  7:28     ` Michal Hocko
2017-06-02  7:40       ` Levin, Alexander (Sasha Levin)
2017-06-02  7:50         ` Michal Hocko
2017-03-06 10:30 ` [PATCH 2/9] mm: support __GFP_REPEAT in kvmalloc_node for >32kB Michal Hocko
2017-04-07  0:45   ` Shakeel Butt
2017-04-07  7:40     ` Michal Hocko
2017-03-06 10:30 ` [PATCH 3/9] rhashtable: simplify a strange allocation pattern Michal Hocko
2017-03-06 10:30 ` [PATCH 4/9] ila: " Michal Hocko
2017-03-06 10:33 ` [PATCH 5/9] xattr: zero out memory copied to userspace in getxattr Michal Hocko
2017-03-06 10:33   ` [PATCH 6/9] treewide: use kv[mz]alloc* rather than opencoded variants Michal Hocko
2017-03-06 10:33   ` [PATCH 7/9] net: use kvmalloc with __GFP_REPEAT rather than open coded variant Michal Hocko
2017-03-30 23:21     ` Shakeel Butt
2017-03-31  8:46       ` Michal Hocko
2017-03-06 10:33   ` [PATCH 8/9] md: use kvmalloc rather than opencoded variant Michal Hocko
2017-03-06 10:33   ` Michal Hocko [this message]

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