Displaying 14 results from an estimated 14 matches for "vipt".
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vip
2019 Mar 14
0
[RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
...el_dcache_page() and the former is hugely expensive and
> usually unnecessary because GUP already flushed all the user aliases.
>
> In the interests of full disclosure the reason we do it for parisc is
> because our later machines have problems even with clean aliases. So
> on most VIPT systems, doing kmap/read/kunmap creates a fairly harmless
> clean alias. Technically it should be invalidated, because if you
> remap the same page to the same colour you get cached stale data, but
> in practice the data is expired from the cache long before that
> happens, so the prob...
2016 Feb 22
2
Re: Cubietruck: QEMU, KVM and Fedora
...uilt with KVM module enabled?
> With more current QEMU -cpu [ -machine ] still is valid ?
>
> Thanks,
>
> Thomas
>
>
> root@cubietruck:~# dmesg | grep CPU
> [ 0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7),
> cr=30c5387d
> [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
> instruction cache
> [ 0.000000] PERCPU: Embedded 12 pages/cpu @ee5c0000 s19916 r8192 d21044
> u49152
> [ 0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
> [ 0.004932] CPU: Testing write buffer coherency: ok
> [ 0....
2019 Mar 12
0
[RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
...ernel memory not to
modify userland memory (where get/put_user is more commonly used
instead..), there's no cache aliasing in such case.
> Actually copy_user_page() is unused in the main kernel. The big
> problem is copy_user_highpage() but that's mostly highly optimised by
> the VIPT architectures (in other words you can fiddle with kmap without
> impacting it).
copy_user_page is not unused, it's called precisely by
copy_user_highpage, which is why the cache flushes are done inside
copy_user_page.
static inline void copy_user_highpage(struct page *to, struct page *from...
2019 Mar 12
9
[RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
On Tue, Mar 12, 2019 at 10:59:09AM +0800, Jason Wang wrote:
>
> On 2019/3/12 ??2:14, David Miller wrote:
> > From: "Michael S. Tsirkin" <mst at redhat.com>
> > Date: Mon, 11 Mar 2019 09:59:28 -0400
> >
> > > On Mon, Mar 11, 2019 at 03:13:17PM +0800, Jason Wang wrote:
> > > > On 2019/3/8 ??10:12, Christoph Hellwig wrote:
> > >
2019 Mar 12
9
[RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap()
On Tue, Mar 12, 2019 at 10:59:09AM +0800, Jason Wang wrote:
>
> On 2019/3/12 ??2:14, David Miller wrote:
> > From: "Michael S. Tsirkin" <mst at redhat.com>
> > Date: Mon, 11 Mar 2019 09:59:28 -0400
> >
> > > On Mon, Mar 11, 2019 at 03:13:17PM +0800, Jason Wang wrote:
> > > > On 2019/3/8 ??10:12, Christoph Hellwig wrote:
> > >
2016 Nov 16
2
[PATCH 1/1] sched: provide common cpu_relax_yield definition
...isc/include/asm/processor.h
@@ -309,7 +309,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
#define cpu_relax() barrier()
-#define cpu_relax_yield() cpu_relax()
/*
* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 5684e68..dac83fc 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -404,8 +404,6 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
#define...
2016 Nov 16
2
[PATCH 1/1] sched: provide common cpu_relax_yield definition
...isc/include/asm/processor.h
@@ -309,7 +309,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
#define cpu_relax() barrier()
-#define cpu_relax_yield() cpu_relax()
/*
* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 5684e68..dac83fc 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -404,8 +404,6 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
#define...
2016 Oct 25
0
[GIT PULL v2 5/5] processor.h: remove cpu_relax_lowlatency
...b/arch/parisc/include/asm/processor.h
@@ -310,7 +310,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
#define cpu_relax_yield() cpu_relax()
-#define cpu_relax_lowlatency() cpu_relax()
/*
* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 908fa7c..5684e68 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -405,7 +405,6 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
#endif...
2018 Jan 25
0
Problems getting nouveau to work with either Geforce GT710 or Geforce 9800GT on ARM Cortex-A9
...nux on physical CPU 0x0
[ 0.000000] Linux version 4.15.0-rc8-next2g-gfd920f6-dirty (lpnm at ENIAC10) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #2 SMP Thu Jan 25 12:44:50 WET 2018
[ 0.000000] CPU: ARMv7 Processor [414fc091] revision 1 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] random: fast init done
[ 0.000000] percpu: Embedded 16 pages/cpu @(ptrval) s35212 r8192 d22132 u65536
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 2...
2018 Jan 23
2
Problems getting nouveau to work with either Geforce GT710 or Geforce 9800GT on ARM Cortex-A9
...nux on physical CPU 0x0
[ 0.000000] Linux version 4.15.0-rc4-next2g-g400b6af-dirty (lpnm at ENIAC10) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #2 SMP Sun Jan 21 11:08:49 WET 2018
[ 0.000000] CPU: ARMv7 Processor [414fc091] revision 1 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] random: fast init done
[ 0.000000] percpu: Embedded 16 pages/cpu @(ptrval) s35148 r8192 d22196 u65536
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 2...
2012 Mar 19
24
[PATCHv2 00/11] arm: pass a device tree to dom0
This series of patches makes Xen pass a (somewhat) valid device tree
to dom0. The device tree for dom0 is the same as the one supplied to
Xen except the memory and chosen nodes are adjusted appropriately.
We don''t yet make use of the device tree to map MMIO regions or setup
interrupts for the guest and we still include the UART used for Xen''s
console.
Note that loading Linux
2018 Jan 25
2
Problems getting nouveau to work with either Geforce GT710 or Geforce 9800GT on ARM Cortex-A9
Hi Ben,
Thanks for your reply.
My replies follow in between.
Luís
On Thu, Jan 25, 2018 at 5:40 AM, Ben Skeggs <skeggsb at gmail.com> wrote:
> On 24 January 2018 at 06:19, Luís Mendes <luis.p.mendes at gmail.com> wrote:
>> Hi Arnd,
>>
>> Sorry for sending this email directly to you, but maybe you can help
>> me, or guide me where to look for.
>>
2016 Oct 25
7
[GIT PULL v2 0/5] cpu_relax: drop lowlatency, introduce yield
Peter,
here is v2 with some improved patch descriptions and some fixes. The
previous version has survived one day of linux-next and I only changed
small parts.
So unless there is some other issue, feel free to pull (or to apply
the patches) to tip/locking.
The following changes since commit 07d9a380680d1c0eb51ef87ff2eab5c994949e69:
Linux 4.9-rc2 (2016-10-23 17:10:14 -0700)
are available in
2016 Oct 25
7
[GIT PULL v2 0/5] cpu_relax: drop lowlatency, introduce yield
Peter,
here is v2 with some improved patch descriptions and some fixes. The
previous version has survived one day of linux-next and I only changed
small parts.
So unless there is some other issue, feel free to pull (or to apply
the patches) to tip/locking.
The following changes since commit 07d9a380680d1c0eb51ef87ff2eab5c994949e69:
Linux 4.9-rc2 (2016-10-23 17:10:14 -0700)
are available in