dm: use __GFP_HIGHMEM in __vmalloc
Pages allocated with __vmalloc can be allocated in high memory that is not
directly mapped to kernel space, so use __GFP_HIGHMEM just like vmalloc
does. This patch reduces memory pressure slightly because pages can be
allocated in the high zone.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm-bufio.c | 2
drivers/md/dm-ioctl.c | 189 +++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 188 insertions(+), 3 deletions(-)
Index: linux-3.9.5-fast/drivers/md/dm-bufio.c
===================================================================
--- linux-3.9.5-fast.orig/drivers/md/dm-bufio.c 2013-06-09 01:16:45.000000000 +0200
+++ linux-3.9.5-fast/drivers/md/dm-bufio.c 2013-06-09 01:20:24.000000000 +0200
@@ -350,7 +350,7 @@ static void *alloc_buffer_data(struct dm
if (gfp_mask & __GFP_NORETRY)
noio_flag = memalloc_noio_save();
- ptr = __vmalloc(c->block_size, gfp_mask, PAGE_KERNEL);
+ ptr = __vmalloc(c->block_size, gfp_mask | __GFP_HIGHMEM, PAGE_KERNEL);
if (gfp_mask & __GFP_NORETRY)
memalloc_noio_restore(noio_flag);
Index: linux-3.9.5-fast/drivers/md/dm-ioctl.c
===================================================================
--- linux-3.9.5-fast.orig/drivers/md/dm-ioctl.c 2013-06-09 01:20:14.000000000 +0200
+++ linux-3.9.5-fast/drivers/md/dm-ioctl.c 2013-06-09 01:20:32.000000000 +0200
@@ -1688,7 +1873,7 @@ static int copy_params(struct dm_ioctl _
if (!dmi) {
unsigned noio_flag;
noio_flag = memalloc_noio_save();
- dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH, PAGE_KERNEL);
+ dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
memalloc_noio_restore(noio_flag);
if (dmi)
*param_flags |= DM_PARAMS_VMALLOC;
--
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