On Mon, Oct 15, 2018 at 06:43:06AM -0400, Michael S. Tsirkin wrote:
> On Mon, Oct 15, 2018 at 08:54:27AM +0200, David Hildenbrand wrote:
> > On 12/10/2018 20:05, Michael S. Tsirkin wrote:
> > > On Fri, Oct 12, 2018 at 02:24:27PM +1100, David Gibson wrote:
> > >> When the balloon is inflated, we
>> (And "Expect access in the near future." does not sound like guarantees
>> to me either way)
>
> Should we be concerned about impact on performance though?
Yes, it really depends on the use case (and most of the time, the memory
won't be directly reused). Let's document it in the commit log
On Mon, Oct 15, 2018 at 08:54:27AM +0200, David Hildenbrand wrote:
> On 12/10/2018 20:05, Michael S. Tsirkin wrote:
> > On Fri, Oct 12, 2018 at 02:24:27PM +1100, David Gibson wrote:
> >> When the balloon is inflated, we discard memory place in it using madvise()
> >> with MADV_DONTNEED. And when
On 12/10/2018 20:05, Michael S. Tsirkin wrote:
> On Fri, Oct 12, 2018 at 02:24:27PM +1100, David Gibson wrote:
>> When the balloon is inflated, we discard memory place in it using madvise()
>> with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
>> sounds like it makes sense but
On Fri, Oct 12, 2018 at 09:40:24AM +0200, David Hildenbrand wrote:
> On 12/10/2018 05:24, David Gibson wrote:
> > When the balloon is inflated, we discard memory place in it using madvise()
> > with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
> > sounds like it makes sense
On Fri, Oct 12, 2018 at 10:41:33AM -0700, Richard Henderson wrote:
> On 10/11/18 8:24 PM, David Gibson wrote:
> > When the balloon is inflated, we discard memory place in it using madvise()
> > with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
> > sounds like it makes sense
On Fri, Oct 12, 2018 at 02:24:27PM +1100, David Gibson wrote:
> When the balloon is inflated, we discard memory place in it using madvise()
> with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
> sounds like it makes sense but is actually unnecessary.
>
> The misleadingly
On 10/12/18 12:41 PM, Richard Henderson wrote:
On 10/11/18 8:24 PM, David Gibson wrote:
When the balloon is inflated, we discard memory place in it using madvise()
with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
sounds like it makes sense but is actually unnecessary.
On 10/11/18 8:24 PM, David Gibson wrote:
> When the balloon is inflated, we discard memory place in it using madvise()
> with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
> sounds like it makes sense but is actually unnecessary.
>
> The misleadingly named MADV_DONTNEED just
On 12/10/2018 05:24, David Gibson wrote:
> When the balloon is inflated, we discard memory place in it using madvise()
> with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
> sounds like it makes sense but is actually unnecessary.
>
> The misleadingly named MADV_DONTNEED just
When the balloon is inflated, we discard memory place in it using madvise()
with MADV_DONTNEED. And when we deflate it we use MADV_WILLNEED, which
sounds like it makes sense but is actually unnecessary.
The misleadingly named MADV_DONTNEED just discards the memory in question,
it doesn't set any
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