linux-kernel - [PATCH 7/7] dm: make dm

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Date:	Tue, 7 Jul 2015 11:13:17 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Mike Snitzer <msnitzer@...hat.com>
cc:	"Alasdair G. Kergon" <agk@...hat.com>,
	Edward Thornber <thornber@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, dm-devel@...hat.com
Subject: [PATCH 7/7] dm: make dm_vcalloc use kvmalloc

Make dm_vcalloc use kvmalloc, so that smaller allocations are done with
kmalloc (which is faster).

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

---
 drivers/md/dm-snap-persistent.c |    2 +-
 drivers/md/dm-snap.c            |    2 +-
 drivers/md/dm-table.c           |    8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)

Index: linux-4.2-rc1/drivers/md/dm-snap-persistent.c
===================================================================
--- linux-4.2-rc1.orig/drivers/md/dm-snap-persistent.c	2015-07-07 15:50:23.000000000 +0200
+++ linux-4.2-rc1/drivers/md/dm-snap-persistent.c	2015-07-07 15:59:43.000000000 +0200
@@ -600,7 +600,7 @@ static void persistent_dtr(struct dm_exc
 	free_area(ps);
 
 	/* Allocated in persistent_read_metadata */
-	vfree(ps->callbacks);
+	kvfree(ps->callbacks);
 
 	kfree(ps);
 }
Index: linux-4.2-rc1/drivers/md/dm-snap.c
===================================================================
--- linux-4.2-rc1.orig/drivers/md/dm-snap.c	2015-07-07 15:50:23.000000000 +0200
+++ linux-4.2-rc1/drivers/md/dm-snap.c	2015-07-07 15:59:43.000000000 +0200
@@ -633,7 +633,7 @@ static void dm_exception_table_exit(stru
 			kmem_cache_free(mem, ex);
 	}
 
-	vfree(et->table);
+	kvfree(et->table);
 }
 
 static uint32_t exception_hash(struct dm_exception_table *et, chunk_t chunk)
Index: linux-4.2-rc1/drivers/md/dm-table.c
===================================================================
--- linux-4.2-rc1.orig/drivers/md/dm-table.c	2015-07-07 15:50:25.000000000 +0200
+++ linux-4.2-rc1/drivers/md/dm-table.c	2015-07-07 15:59:43.000000000 +0200
@@ -143,7 +143,7 @@ void *dm_vcalloc(unsigned long nmemb, un
 		return NULL;
 
 	size = nmemb * elem_size;
-	addr = vzalloc(size);
+	addr = kvmalloc(size, GFP_KERNEL | __GFP_ZERO);
 
 	return addr;
 }
@@ -171,7 +171,7 @@ static int alloc_targets(struct dm_table
 	n_targets = (struct dm_target *) (n_highs + num);
 
 	memset(n_highs, -1, sizeof(*n_highs) * num);
-	vfree(t->highs);
+	kvfree(t->highs);
 
 	t->num_allocated = num;
 	t->highs = n_highs;
@@ -235,7 +235,7 @@ void dm_table_destroy(struct dm_table *t
 
 	/* free the indexes */
 	if (t->depth >= 2)
-		vfree(t->index[t->depth - 2]);
+		kvfree(t->index[t->depth - 2]);
 
 	/* free the targets */
 	for (i = 0; i < t->num_targets; i++) {
@@ -247,7 +247,7 @@ void dm_table_destroy(struct dm_table *t
 		dm_put_target_type(tgt->type);
 	}
 
-	vfree(t->highs);
+	kvfree(t->highs);
 
 	/* free the device list */
 	free_devices(&t->devices, t->md);

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