Displaying 20 results from an estimated 83 matches for "kvmalloc".
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kmalloc
2018 Apr 25
7
[PATCH v4] fault-injection: introduce kvmalloc fallback options
On 04/25/2018 01:02 PM, Mikulas Patocka wrote:
>
>
> From: Mikulas Patocka <mpatocka at redhat.com>
> Subject: [PATCH v4] fault-injection: introduce kvmalloc fallback options
>
> This patch introduces a fault-injection option "kvmalloc_fallback". This
> option makes kvmalloc randomly fall back to vmalloc.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
Unfortunately,
> uses DMA-API on the retur...
2018 Apr 25
7
[PATCH v4] fault-injection: introduce kvmalloc fallback options
On 04/25/2018 01:02 PM, Mikulas Patocka wrote:
>
>
> From: Mikulas Patocka <mpatocka at redhat.com>
> Subject: [PATCH v4] fault-injection: introduce kvmalloc fallback options
>
> This patch introduces a fault-injection option "kvmalloc_fallback". This
> option makes kvmalloc randomly fall back to vmalloc.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
Unfortunately,
> uses DMA-API on the retur...
2018 May 02
2
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
...y function like vmalloc.
>
> That 15-line __vmalloc bugfix doesn't prevent you (or any other kernel
> developer) from converting the code to the scope API. You make nonsensical
> excuses.
>
Fun thread!
Winding back to the original problem, I'd state it as
- Caller uses kvmalloc() but passes the address into vmalloc-naive
DMA API and
- Caller uses kvmalloc() but passes the address into kfree()
Yes?
If so, then...
Is there a way in which, in the kvmalloc-called-kmalloc path, we can
tag the slab-allocated memory with a "this memory was allocated with
kvmalloc()&qu...
2018 Apr 25
0
[PATCH v5] fault-injection: introduce kvmalloc fallback options
On Wed, 25 Apr 2018, Randy Dunlap wrote:
> On 04/25/2018 01:02 PM, Mikulas Patocka wrote:
> >
> >
> > From: Mikulas Patocka <mpatocka at redhat.com>
> > Subject: [PATCH v4] fault-injection: introduce kvmalloc fallback options
> >
> > This patch introduces a fault-injection option "kvmalloc_fallback". This
> > option makes kvmalloc randomly fall back to vmalloc.
> >
> > Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
>
> Unfortunate...
2018 Apr 20
4
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Thu 19-04-18 12:12:38, Mikulas Patocka wrote:
[...]
> From: Mikulas Patocka <mpatocka at redhat.com>
> Subject: [PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
>
> The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> kmalloc fails.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> uses DMA-API on the returned memory or frees it with kfree. Such bugs w...
2018 Apr 20
4
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Thu 19-04-18 12:12:38, Mikulas Patocka wrote:
[...]
> From: Mikulas Patocka <mpatocka at redhat.com>
> Subject: [PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
>
> The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> kmalloc fails.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> uses DMA-API on the returned memory or frees it with kfree. Such bugs w...
2018 Apr 19
1
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
...ally returns DMA-able area, but it
> > may return non-DMA area rarely, if the memory is too fragmented. So, we
> > are in a situation, where some networking drivers will randomly fail. Go
> > and find them.
> >
> > Mikulas
>
> Her I submit a patch that makes kvmalloc always use vmalloc if
> CONFIG_DEBUG_VM is defined.
>
>
>
>
> From: Mikulas Patocka <mpatocka at redhat.com>
> Subject: [PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
>
> The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> kma...
2018 Apr 25
0
[PATCH v5] fault-injection: introduce kvmalloc fallback options
On Wed, 25 Apr 2018, David Rientjes wrote:
> On Wed, 25 Apr 2018, Mikulas Patocka wrote:
>
> > From: Mikulas Patocka <mpatocka at redhat.com>
> > Subject: [PATCH] fault-injection: introduce kvmalloc fallback options
> >
> > This patch introduces a fault-injection option "kvmalloc_fallback". This
> > option makes kvmalloc randomly fall back to vmalloc.
> >
> > Unfortunately, some kernel code has bugs - it uses kvmalloc and then
> > uses DMA-API on...
2018 Apr 18
7
[PATCH] net: don't use kvzalloc for DMA memory
On Wed, 18 Apr 2018, David Miller wrote:
> From: Mikulas Patocka <mpatocka at redhat.com>
> Date: Wed, 18 Apr 2018 12:44:25 -0400 (EDT)
>
> > The structure net_device is followed by arbitrary driver-specific data
> > (accessible with the function netdev_priv). And for virtio-net, these
> > driver-specific data must be in DMA memory.
>
> And we are saying
2018 Apr 20
0
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Fri, 20 Apr 2018, Michal Hocko wrote:
> On Thu 19-04-18 12:12:38, Mikulas Patocka wrote:
> [...]
> > From: Mikulas Patocka <mpatocka at redhat.com>
> > Subject: [PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
> >
> > The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> > kmalloc fails.
> >
> > Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> > uses DMA-API on the returned memory or fr...
2018 Apr 19
2
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Thu, 19 Apr 2018 12:12:38 -0400 (EDT) Mikulas Patocka <mpatocka at redhat.com> wrote:
> The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> kmalloc fails.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> uses DMA-API on the returned memory or frees it with kfree. Such bugs were
> found in the virtio-net driver, dm-integrity or RHEL7...
2018 Apr 19
2
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Thu, 19 Apr 2018 12:12:38 -0400 (EDT) Mikulas Patocka <mpatocka at redhat.com> wrote:
> The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> kmalloc fails.
>
> Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> uses DMA-API on the returned memory or frees it with kfree. Such bugs were
> found in the virtio-net driver, dm-integrity or RHEL7...
2018 Apr 25
0
[PATCH v4] fault-injection: introduce kvmalloc fallback options
...on for the default on makes sense
> to me.
Yes - the debug kernels use the same default kernel parameters as
non-debug kernels and it is expected that all debug features are enabled
by default.
Here I'm sending the patch using the fault-injection framework and the new
option CONFIG_FAIL_KVMALLOC_FALLBACK_PROBABILITY.
Mikulas
From: Mikulas Patocka <mpatocka at redhat.com>
Subject: [PATCH v4] fault-injection: introduce kvmalloc fallback options
This patch introduces a fault-injection option "kvmalloc_fallback". This
option makes kvmalloc randomly fall back to vmalloc.
U...
2018 Apr 24
4
[PATCH v3] kvmalloc: always use vmalloc if CONFIG_DEBUG_SG
...gt;
> > > > >
> > > > > On Tue, 24 Apr 2018, Michal Hocko wrote:
> > > > >
> > > > > > On Mon 23-04-18 20:06:16, Mikulas Patocka wrote:
> > > > > > [...]
> > > > > > > @@ -404,6 +405,12 @@ void *kvmalloc_node(size_t size, gfp_t f
> > > > > > > */
> > > > > > > WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);
> > > > > > >
> > > > > > > +#ifdef CONFIG_DEBUG_SG
> > > > > > > + /* Catch...
2018 Apr 19
0
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
...e problem here is that kvzalloc usually returns DMA-able area, but it
> may return non-DMA area rarely, if the memory is too fragmented. So, we
> are in a situation, where some networking drivers will randomly fail. Go
> and find them.
>
> Mikulas
Her I submit a patch that makes kvmalloc always use vmalloc if
CONFIG_DEBUG_VM is defined.
From: Mikulas Patocka <mpatocka at redhat.com>
Subject: [PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
The kvmalloc function tries to use kmalloc and falls back to vmalloc if
kmalloc fails.
Unfortunatelly, some kernel code has...
2018 Apr 24
0
[PATCH v3] kvmalloc: always use vmalloc if CONFIG_DEBUG_SG
The kvmalloc function tries to use kmalloc and falls back to vmalloc if
kmalloc fails.
Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
uses DMA-API on the returned memory or frees it with kfree. Such bugs were
found in the virtio-net driver, dm-integrity or RHEL7 powerpc-specific
code.
T...
2018 Apr 24
0
[PATCH v3] kvmalloc: always use vmalloc if CONFIG_DEBUG_SG
On Mon, 23 Apr 2018, David Rientjes wrote:
> On Mon, 23 Apr 2018, Mikulas Patocka wrote:
>
> > The kvmalloc function tries to use kmalloc and falls back to vmalloc if
> > kmalloc fails.
> >
> > Unfortunatelly, some kernel code has bugs - it uses kvmalloc and then
> > uses DMA-API on the returned memory or frees it with kfree. Such bugs were
> > found in the virtio-net drive...
2018 Apr 24
3
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Tue 24-04-18 11:30:40, Mikulas Patocka wrote:
>
>
> On Tue, 24 Apr 2018, Michal Hocko wrote:
>
> > On Mon 23-04-18 20:25:15, Mikulas Patocka wrote:
> >
> > > Fixing __vmalloc code
> > > is easy and it doesn't require cooperation with maintainers.
> >
> > But it is a hack against the intention of the scope api.
>
> It is not!
2018 Apr 24
3
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Tue 24-04-18 11:30:40, Mikulas Patocka wrote:
>
>
> On Tue, 24 Apr 2018, Michal Hocko wrote:
>
> > On Mon 23-04-18 20:25:15, Mikulas Patocka wrote:
> >
> > > Fixing __vmalloc code
> > > is easy and it doesn't require cooperation with maintainers.
> >
> > But it is a hack against the intention of the scope api.
>
> It is not!
2018 Apr 19
1
[PATCH] kvmalloc: always use vmalloc if CONFIG_DEBUG_VM
On Thu, 19 Apr 2018 17:19:20 -0400 (EDT) Mikulas Patocka <mpatocka at redhat.com> wrote:
> > > In order to detect these bugs reliably I submit this patch that changes
> > > kvmalloc to always use vmalloc if CONFIG_DEBUG_VM is turned on.
> > >
> > > ...
> > >
> > > --- linux-2.6.orig/mm/util.c 2018-04-18 15:46:23.000000000 +0200
> > > +++ linux-2.6/mm/util.c 2018-04-18 16:00:43.000000000 +0200
> > > @@ -395,6 +395,7 @@ EXPO...