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[PATCH 17/20] dm: get rid of superfluous gfp flags

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  [PATCH 17/20] dm: get rid of superfluous gfp flags Michal Hocko <mhocko@kernel.org> - 2016-04-28 15:30 +0200
    Re: [PATCH 17/20] dm: get rid of superfluous gfp flags Mike Snitzer <snitzer@redhat.com> - 2016-04-29 21:00 +0200
      Re: [PATCH 17/20] dm: get rid of superfluous gfp flags Michal Hocko <mhocko@kernel.org> - 2016-05-02 09:40 +0200

#1390171 — [PATCH 17/20] dm: get rid of superfluous gfp flags

From: Michal Hocko <mhocko@suse.com>

copy_params seems to be little bit confused about which allocation flags
to use. It enforces GFP_NOIO even though it uses
memalloc_noio_{save,restore} which enforces GFP_NOIO at the page
allocator level automatically (via memalloc_noio_flags). It also
uses __GFP_REPEAT for the __vmalloc request which doesn't make much
sense either because vmalloc doesn't rely on costly high order
allocations. Let's just drop the __GFP_REPEAT and leave the further
cleanup to later changes.

Cc: Shaohua Li <shli@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 drivers/md/dm-ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2adf81d81fca..2c7ca258c4e4 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1723,7 +1723,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
 	if (!dmi) {
 		unsigned noio_flag;
 		noio_flag = memalloc_noio_save();
-		dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
+		dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
 		memalloc_noio_restore(noio_flag);
 		if (dmi)
 			*param_flags |= DM_PARAMS_VMALLOC;
-- 
2.8.0.rc3

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#1391333

On Thu, Apr 28 2016 at  9:24am -0400,
Michal Hocko <mhocko@kernel.org> wrote:

> From: Michal Hocko <mhocko@suse.com>
> 
> copy_params seems to be little bit confused about which allocation flags
> to use. It enforces GFP_NOIO even though it uses
> memalloc_noio_{save,restore} which enforces GFP_NOIO at the page
> allocator level automatically (via memalloc_noio_flags). It also
> uses __GFP_REPEAT for the __vmalloc request which doesn't make much
> sense either because vmalloc doesn't rely on costly high order
> allocations. Let's just drop the __GFP_REPEAT and leave the further
> cleanup to later changes.
> 
> Cc: Shaohua Li <shli@kernel.org>
> Cc: Mikulas Patocka <mpatocka@redhat.com>
> Cc: dm-devel@redhat.com
> Signed-off-by: Michal Hocko <mhocko@suse.com>

I've taken this patch for 4.7 but editted the header, see:
https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-4.7&id=0222c76e96163355620224625c1cd80991086dc7

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#1392035

On Fri 29-04-16 14:54:52, Mike Snitzer wrote:
> On Thu, Apr 28 2016 at  9:24am -0400,
> Michal Hocko <mhocko@kernel.org> wrote:
> 
> > From: Michal Hocko <mhocko@suse.com>
> > 
> > copy_params seems to be little bit confused about which allocation flags
> > to use. It enforces GFP_NOIO even though it uses
> > memalloc_noio_{save,restore} which enforces GFP_NOIO at the page
> > allocator level automatically (via memalloc_noio_flags). It also
> > uses __GFP_REPEAT for the __vmalloc request which doesn't make much
> > sense either because vmalloc doesn't rely on costly high order
> > allocations. Let's just drop the __GFP_REPEAT and leave the further
> > cleanup to later changes.
> > 
> > Cc: Shaohua Li <shli@kernel.org>
> > Cc: Mikulas Patocka <mpatocka@redhat.com>
> > Cc: dm-devel@redhat.com
> > Signed-off-by: Michal Hocko <mhocko@suse.com>
> 
> I've taken this patch for 4.7 but editted the header, see:
> https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-4.7&id=0222c76e96163355620224625c1cd80991086dc7

Thanks!

-- 
Michal Hocko
SUSE Labs

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