On Tue, Oct 22, 2019 at 12:33:25PM +0200, Oscar Salvador wrote:
> On Tue, Oct 22, 2019 at 12:24:57PM +0200, Michal Hocko wrote:
> > Yes, that makes a perfect sense. What I am saying that the migration
> > (aka trying to recover) is the main and only difference. The soft
> > offline should poison
On Tue, Oct 22, 2019 at 11:58:52AM +0200, Oscar Salvador wrote:
> On Tue, Oct 22, 2019 at 11:22:56AM +0200, Michal Hocko wrote:
> > Hmm, that might be a misunderstanding on my end. I thought that it is
> > the MCE handler to say whether the failure is recoverable or not. If yes
> > then we can
On Tue, Oct 22, 2019 at 12:24:57PM +0200, Michal Hocko wrote:
> Yes, that makes a perfect sense. What I am saying that the migration
> (aka trying to recover) is the main and only difference. The soft
> offline should poison page tables when not able to migrate as well
> IIUC.
Yeah, I see your
On Tue 22-10-19 11:58:52, Oscar Salvador wrote:
> On Tue, Oct 22, 2019 at 11:22:56AM +0200, Michal Hocko wrote:
> > Hmm, that might be a misunderstanding on my end. I thought that it is
> > the MCE handler to say whether the failure is recoverable or not. If yes
> > then we can touch the content
On Tue, Oct 22, 2019 at 11:22:56AM +0200, Michal Hocko wrote:
> Hmm, that might be a misunderstanding on my end. I thought that it is
> the MCE handler to say whether the failure is recoverable or not. If yes
> then we can touch the content of the memory (that would imply the
> migration). Other
On Tue 22-10-19 10:35:17, Oscar Salvador wrote:
> On Tue, Oct 22, 2019 at 10:26:11AM +0200, Michal Hocko wrote:
> > On Tue 22-10-19 09:46:20, Oscar Salvador wrote:
> > [...]
> > > So, opposite to hard-offline, in soft-offline we do not fiddle with pages
> > > unless we are sure the page is not
On Tue, Oct 22, 2019 at 10:26:11AM +0200, Michal Hocko wrote:
> On Tue 22-10-19 09:46:20, Oscar Salvador wrote:
> [...]
> > So, opposite to hard-offline, in soft-offline we do not fiddle with pages
> > unless we are sure the page is not reachable anymore by any means.
>
> I have to say I do not
On Tue 22-10-19 09:46:20, Oscar Salvador wrote:
[...]
> So, opposite to hard-offline, in soft-offline we do not fiddle with pages
> unless we are sure the page is not reachable anymore by any means.
I have to say I do not follow. Is there any _real_ reason for
soft-offline to behave differenttly
On Mon, Oct 21, 2019 at 07:45:33AM +, Naoya Horiguchi wrote:
> > +extern bool take_page_off_buddy(struct page *page);
> > +
> > +static void page_handle_poison(struct page *page)
>
> hwpoison is a separate idea from page poisoning, so maybe I think
> it's better to be named like
On Mon, Oct 21, 2019 at 05:41:58PM +0200, Michal Hocko wrote:
> On Mon 21-10-19 14:58:49, Oscar Salvador wrote:
> > Nothing prevents the page to be allocated in the meantime.
> > We would just bail out and return -EBUSY to userspace.
> > Since we do not do __anything__ to the page until we are
On Mon 21-10-19 14:58:49, Oscar Salvador wrote:
> On Fri, Oct 18, 2019 at 02:06:15PM +0200, Michal Hocko wrote:
> > On Thu 17-10-19 16:21:17, Oscar Salvador wrote:
> > [...]
> > > +bool take_page_off_buddy(struct page *page)
> > > + {
> > > + struct zone *zone = page_zone(page);
> > > + unsigned
On Fri, Oct 18, 2019 at 02:06:15PM +0200, Michal Hocko wrote:
> On Thu 17-10-19 16:21:17, Oscar Salvador wrote:
> [...]
> > +bool take_page_off_buddy(struct page *page)
> > + {
> > + struct zone *zone = page_zone(page);
> > + unsigned long pfn = page_to_pfn(page);
> > + unsigned long flags;
On Thu, Oct 17, 2019 at 04:21:17PM +0200, Oscar Salvador wrote:
> When trying to soft-offline a free page, we need to first take it off
> the buddy allocator.
> Once we know is out of reach, we can safely flag it as poisoned.
>
> take_page_off_buddy will be used to take a page meant to be
On Thu 17-10-19 16:21:17, Oscar Salvador wrote:
[...]
> +bool take_page_off_buddy(struct page *page)
> + {
> + struct zone *zone = page_zone(page);
> + unsigned long pfn = page_to_pfn(page);
> + unsigned long flags;
> + unsigned int order;
> + bool ret = false;
> +
> +
When trying to soft-offline a free page, we need to first take it off
the buddy allocator.
Once we know is out of reach, we can safely flag it as poisoned.
take_page_off_buddy will be used to take a page meant to be poisoned
off the buddy allocator.
take_page_off_buddy calls
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