On Thu, Jun 25, 2020 at 4:42 AM Matthew Wilcox wrote:
>
> On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> > A side effect of the LRU shrinker not being dma aware is that we will
> > often attempt to perform direct reclaim on the persistent group of dma
> > pages while continuing to
On Thu, Jun 25, 2020 at 03:40:44PM +0200, Jan Kara wrote:
> On Thu 25-06-20 12:42:09, Matthew Wilcox wrote:
> > Why are DMA pinned pages still on the LRU list at all? I never got an
> > answer to this that made sense to me. By definition, a page which is
> > pinned for DMA is being accessed, and
On Thu 25-06-20 12:00:47, Chris Wilson wrote:
> Quoting Michal Hocko (2020-06-25 08:57:25)
> > On Wed 24-06-20 20:14:17, Chris Wilson wrote:
> > > A general rule of thumb is that shrinkers should be fast and effective.
> > > They are called from direct reclaim at the most incovenient of times when
On Thu 25-06-20 12:42:09, Matthew Wilcox wrote:
> On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> > A side effect of the LRU shrinker not being dma aware is that we will
> > often attempt to perform direct reclaim on the persistent group of dma
> > pages while continuing to use the
On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> A side effect of the LRU shrinker not being dma aware is that we will
> often attempt to perform direct reclaim on the persistent group of dma
> pages while continuing to use the dma HW (an issue as the HW may already
> be actively wai
On Wed 24-06-20 17:11:30, John Hubbard wrote:
> On 2020-06-24 16:20, Jason Gunthorpe wrote:
> > > I do like this code change, though. And I *think* it's actually safe to
> > > do this, as it stays away from writeback or other filesystem activity.
> > > But let me double check that, in case I'm forg
On Wed 24-06-20 20:14:17, Chris Wilson wrote:
> A general rule of thumb is that shrinkers should be fast and effective.
> They are called from direct reclaim at the most incovenient of times when
> the caller is waiting for a page. If we attempt to reclaim a page being
> pinned for active dma [pin_
On 2020-06-24 16:20, Jason Gunthorpe wrote:
...
I think Yang explained it - the page is removed from the mappings but
freeing it does not happen because page_ref_freeze() does not succeed
due to the pin.
Presumably the mappings can reconnect to the same physical page if
it is re-faulted to avoid
On Wed, Jun 24, 2020 at 01:47:23PM -0700, John Hubbard wrote:
> On 2020-06-24 12:21, Jason Gunthorpe wrote:
> > On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> > > A general rule of thumb is that shrinkers should be fast and effective.
> > > They are called from direct reclaim at th
On Wed, Jun 24, 2020 at 1:23 PM Yang Shi wrote:
>
> On Wed, Jun 24, 2020 at 12:21 PM Jason Gunthorpe wrote:
> >
> > On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> > > A general rule of thumb is that shrinkers should be fast and effective.
> > > They are called from direct reclaim
On 2020-06-24 12:21, Jason Gunthorpe wrote:
On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
A general rule of thumb is that shrinkers should be fast and effective.
They are called from direct reclaim at the most incovenient of times when
the caller is waiting for a page. If we atte
On Wed, Jun 24, 2020 at 12:21 PM Jason Gunthorpe wrote:
>
> On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> > A general rule of thumb is that shrinkers should be fast and effective.
> > They are called from direct reclaim at the most incovenient of times when
> > the caller is wait
On Wed, Jun 24, 2020 at 08:14:17PM +0100, Chris Wilson wrote:
> A general rule of thumb is that shrinkers should be fast and effective.
> They are called from direct reclaim at the most incovenient of times when
> the caller is waiting for a page. If we attempt to reclaim a page being
> pinned for
A general rule of thumb is that shrinkers should be fast and effective.
They are called from direct reclaim at the most incovenient of times when
the caller is waiting for a page. If we attempt to reclaim a page being
pinned for active dma [pin_user_pages()], we will incur far greater
latency than
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