On 2019/3/15 上午3:33, Andrea Arcangeli wrote:
Hello Jason,
On Thu, Mar 14, 2019 at 09:49:03PM +0800, Jason Wang wrote:
Yes since we don't want to slow down 32bit.
If you've a lot of ram there's no justification to stick to a 32bit
kernel, so I don't think there's need to maintain a separate mo
Hello Jason,
On Thu, Mar 14, 2019 at 09:49:03PM +0800, Jason Wang wrote:
> Yes since we don't want to slow down 32bit.
If you've a lot of ram there's no justification to stick to a 32bit
kernel, so I don't think there's need to maintain a separate model
just for 32bit. I really wouldn't care abou
On 2019/3/14 下午6:42, Michael S. Tsirkin wrote:
Which means after we fix vhost to add the flush_dcache_page after
kunmap, Parisc will get a double hit (but it also means Parisc
was the only one of those archs needed explicit cache flushes,
where vhost worked correctly so far.. so it kinds of proo
On Wed, Mar 13, 2019 at 09:37:08AM -0700, James Bottomley wrote:
> On Wed, 2019-03-13 at 09:05 -0700, Christoph Hellwig wrote:
> > On Tue, Mar 12, 2019 at 01:53:37PM -0700, James Bottomley wrote:
> > > I've got to say: optimize what? What code do we ever have in the
> > > kernel that kmap's a page
On Tue, Mar 12, 2019 at 01:53:37PM -0700, James Bottomley wrote:
> I've got to say: optimize what? What code do we ever have in the
> kernel that kmap's a page and then doesn't do anything with it? You can
> guarantee that on kunmap the page is either referenced (needs
> invalidating) or updated (
On Tue, Mar 12, 2019 at 03:02:54PM -0700, James Bottomley wrote:
> I'm sure there must be workarounds elsewhere in the other arch code
> otherwise things like this, which appear all over drivers/, wouldn't
> work:
>
> drivers/scsi/isci/request.c:1430
>
> kaddr = kmap_atomic(page);
> m
On Tue, Mar 12, 2019 at 02:19:15PM -0700, James Bottomley wrote:
> I mean in the sequence
>
> flush_dcache_page(page);
> flush_dcache_page(page);
>
> The first flush_dcache_page did all the work and the second it a
> tightly pipelined no-op. That's what I mean by there not really being
> a doubl
On Tue, Mar 12, 2019 at 01:53:37PM -0700, James Bottomley wrote:
> I've got to say: optimize what? What code do we ever have in the
> kernel that kmap's a page and then doesn't do anything with it? You can
> guarantee that on kunmap the page is either referenced (needs
> invalidating) or updated (
On Tue, Mar 12, 2019 at 08:46:50AM -0700, James Bottomley wrote:
> On Tue, 2019-03-12 at 07:54 -0400, Michael S. Tsirkin wrote:
> > On Tue, Mar 12, 2019 at 03:17:00PM +0800, Jason Wang wrote:
> > >
> > > On 2019/3/12 ä¸å11:52, Michael S. Tsirkin wrote:
> > > > On Tue, Mar 12, 2019 at 10:59:09AM
On Tue, Mar 12, 2019 at 03:17:00PM +0800, Jason Wang wrote:
>
> On 2019/3/12 上午11:52, Michael S. Tsirkin wrote:
> > On Tue, Mar 12, 2019 at 10:59:09AM +0800, Jason Wang wrote:
> > > On 2019/3/12 上午2:14, David Miller wrote:
> > > > From: "Michael S. Tsirkin"
> > > > Date: Mon, 11 Mar 2019 09:59:28
On 2019/3/12 下午3:51, Jason Wang wrote:
On 2019/3/12 下午1:14, James Bottomley wrote:
On Tue, 2019-03-12 at 10:59 +0800, Jason Wang wrote:
On 2019/3/12 上午2:14, David Miller wrote:
From: "Michael S. Tsirkin"
Date: Mon, 11 Mar 2019 09:59:28 -0400
On Mon, Mar 11, 2019 at 03:13:17PM +0800, Jason
On 2019/3/12 下午1:14, James Bottomley wrote:
On Tue, 2019-03-12 at 10:59 +0800, Jason Wang wrote:
On 2019/3/12 上午2:14, David Miller wrote:
From: "Michael S. Tsirkin"
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 下午10:12, Christ
On 2019/3/12 上午11:52, Michael S. Tsirkin wrote:
On Tue, Mar 12, 2019 at 10:59:09AM +0800, Jason Wang wrote:
On 2019/3/12 上午2:14, David Miller wrote:
From: "Michael S. Tsirkin"
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 下午10
On Tue, Mar 12, 2019 at 10:59:09AM +0800, Jason Wang wrote:
>
> On 2019/3/12 上午2:14, David Miller wrote:
> > From: "Michael S. Tsirkin"
> > 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 下午10:12, Christoph Hellwig w
On 2019/3/12 上午2:14, David Miller wrote:
From: "Michael S. Tsirkin"
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 下午10:12, Christoph Hellwig wrote:
On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
This series tries
From: "Michael S. Tsirkin"
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 下午10:12, Christoph Hellwig wrote:
>> > On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
>> > > This series tries to access virtqueue metadat
On Mon, Mar 11, 2019 at 03:13:17PM +0800, Jason Wang wrote:
>
> On 2019/3/8 下午10:12, Christoph Hellwig wrote:
> > On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
> > > This series tries to access virtqueue metadata through kernel virtual
> > > address instead of copy_user() friends sin
On 2019/3/8 下午10:12, Christoph Hellwig wrote:
On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
This series tries to access virtqueue metadata through kernel virtual
address instead of copy_user() friends since they had too much
overheads like checks, spec barriers or even hardware fe
On Wed, Mar 06, 2019 at 02:18:07AM -0500, Jason Wang wrote:
> This series tries to access virtqueue metadata through kernel virtual
> address instead of copy_user() friends since they had too much
> overheads like checks, spec barriers or even hardware feature
> toggling. This is done through setup
This series tries to access virtqueue metadata through kernel virtual
address instead of copy_user() friends since they had too much
overheads like checks, spec barriers or even hardware feature
toggling. This is done through setup kernel address through vmap() and
resigter MMU notifier for invalid
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