From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
virtio-dev@lists.oasis-open.org, kvm list <kvm@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Matthew Wilcox <willy@infradead.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
will@kernel.org, linux-arm-kernel@lists.infradead.org,
Oscar Salvador <osalvador@suse.de>,
Yang Zhang <yang.zhang.wz@gmail.com>,
Pankaj Gupta <pagupta@redhat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Nitesh Narayan Lal <nitesh@redhat.com>,
Rik van Riel <riel@surriel.com>,
lcapitulino@redhat.com, "Wang, Wei W" <wei.w.wang@intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
ying.huang@intel.com, Paolo Bonzini <pbonzini@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Fengguang Wu <fengguang.wu@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [virtio-dev] Re: [PATCH v9 0/8] stg mail -e --version=v9 \
Date: Wed, 11 Sep 2019 18:09:18 +0200 [thread overview]
Message-ID: <abea20a0-463c-68c0-e810-2e341d971b30@redhat.com> (raw)
In-Reply-To: <20190911135100.GC4023@dhcp22.suse.cz>
On 11.09.19 15:51, Michal Hocko wrote:
> On Wed 11-09-19 15:20:02, Michal Hocko wrote:
> [...]
>>> 4. Continuously report, not the "one time report everything" approach.
>>
>> So you mean the allocator reporting this rather than an external code to
>> poll right? I do not know, how much this is nice to have than must have?
>
> Another idea that I haven't really thought through so it might turned
> out to be completely bogus but let's try anyway. Your "report everything"
> just made me look and realize that free_pages_prepare already performs
> stuff that actually does something similar yet unrelated.
>
> We do report to special page poisoning, zeroying or
> CONFIG_DEBUG_PAGEALLOC to unmap the address from the kernel address
> space. This sounds like something fitting your model no?
>
AFAIKS, the poisoning/unmapping is done whenever a page is freed. I
don't quite see yet how that would help to remember if a page was
already reported. After reporting the page we would have to switch some
state (Nitesh: bitmap bit, Alexander: page flag) to identify that.
Of course, we could map the page and treat that as "the state" when we
reported it, but I am not sure that's such a good idea :)
As always, I might be very wrong ...
--
Thanks,
David / dhildenb
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next prev parent reply other threads:[~2019-09-11 16:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-07 17:25 [virtio-dev] [PATCH v9 0/8] stg mail -e --version=v9 \ Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 1/8] mm: Add per-cpu logic to page shuffling Alexander Duyck
2019-09-09 8:14 ` [virtio-dev] " David Hildenbrand
2019-09-09 15:11 ` Alexander Duyck
[not found] ` <20190910121130.GU2063@dhcp22.suse.cz>
2019-09-10 22:14 ` Alexander Duyck
2019-09-10 22:11 ` Alexander Duyck
[not found] ` <20190909090701.7ebz4foxyu3rxzvc@box>
2019-09-09 15:12 ` Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 2/8] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2019-09-09 8:19 ` [virtio-dev] " David Hildenbrand
[not found] ` <20190909094700.bbslsxpuwvxmodal@box>
2019-09-09 15:22 ` Alexander Duyck
[not found] ` <20190909153529.3crs74uraos27ffh@box>
2019-09-09 15:37 ` Alexander Duyck
2019-09-09 16:43 ` Alexander Duyck
[not found] ` <20190910122030.GV2063@dhcp22.suse.cz>
2019-09-10 14:48 ` Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 3/8] mm: Move set/get_pcppage_migratetype to mmzone.h Alexander Duyck
2019-09-09 8:22 ` [virtio-dev] " David Hildenbrand
[not found] ` <20190909095608.jwachx3womhqmjbl@box>
2019-09-09 18:01 ` Alexander Duyck
2019-09-09 18:12 ` Alexander Duyck
[not found] ` <20190910122313.GW2063@dhcp22.suse.cz>
2019-09-10 14:46 ` Alexander Duyck
[not found] ` <20190910174553.GC4023@dhcp22.suse.cz>
2019-09-10 20:26 ` Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 4/8] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 5/8] arm64: Move hugetlb related definitions out of pgtable.h to page-defs.h Alexander Duyck
2019-09-09 8:52 ` [virtio-dev] " David Hildenbrand
2019-09-09 15:27 ` Alexander Duyck
[not found] ` <20190917174853.5csycb5pb5zalsxd@willie-the-truck>
2019-09-17 20:07 ` Alexander Duyck
2019-09-07 17:25 ` [virtio-dev] [PATCH v9 6/8] mm: Introduce Reported pages Alexander Duyck
[not found] ` <20190909144209.jcrx6o3ntecdaqmh@box>
2019-09-09 16:25 ` [virtio-dev] " Alexander Duyck
2019-09-07 17:26 ` [virtio-dev] [PATCH v9 7/8] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck
2019-09-09 8:59 ` [virtio-dev] " David Hildenbrand
2019-09-09 15:31 ` Alexander Duyck
2019-09-07 17:26 ` [virtio-dev] [PATCH v9 8/8] virtio-balloon: Add support for providing unused page reports to host Alexander Duyck
2019-09-07 17:34 ` [virtio-dev] Re: [PATCH v9 0/8] mm / virtio: Provide support for unused page reporting Alexander Duyck
[not found] ` <20190910124209.GY2063@dhcp22.suse.cz>
2019-09-10 14:42 ` [virtio-dev] Re: [PATCH v9 0/8] stg mail -e --version=v9 \ Alexander Duyck
[not found] ` <20190910144713.GF2063@dhcp22.suse.cz>
2019-09-10 16:05 ` Alexander Duyck
2019-09-10 16:18 ` Dr. David Alan Gilbert
2019-09-10 16:22 ` David Hildenbrand
2019-09-11 9:23 ` Michael S. Tsirkin
2019-09-11 9:50 ` David Hildenbrand
[not found] ` <20190910175213.GD4023@dhcp22.suse.cz>
[not found] ` <20190910180026.GE4023@dhcp22.suse.cz>
2019-09-10 20:37 ` Alexander Duyck
2019-09-10 21:23 ` Alexander Duyck
[not found] ` <20190911113619.GP4023@dhcp22.suse.cz>
2019-09-11 11:47 ` David Hildenbrand
2019-09-11 12:08 ` Michael S. Tsirkin
[not found] ` <20190911121941.GU4023@dhcp22.suse.cz>
[not found] ` <20190911122526.GV4023@dhcp22.suse.cz>
2019-09-11 12:42 ` David Hildenbrand
2019-09-11 12:55 ` Nitesh Narayan Lal
[not found] ` <20190911125413.GY4023@dhcp22.suse.cz>
2019-09-11 13:03 ` David Hildenbrand
[not found] ` <20190911132002.GA4023@dhcp22.suse.cz>
2019-09-11 14:03 ` Nitesh Narayan Lal
2019-09-11 16:02 ` David Hildenbrand
[not found] ` <20190911135100.GC4023@dhcp22.suse.cz>
2019-09-11 16:09 ` David Hildenbrand [this message]
[not found] ` <20190912071633.GL4023@dhcp22.suse.cz>
2019-09-12 7:47 ` David Hildenbrand
2019-09-12 12:00 ` Nitesh Narayan Lal
2019-09-11 13:19 ` Nitesh Narayan Lal
2019-09-11 15:12 ` Alexander Duyck
[not found] ` <20190912091925.GM4023@dhcp22.suse.cz>
2019-09-12 15:42 ` Alexander Duyck
[not found] ` <20190912163525.GV2739@techsingularity.net>
2019-09-12 17:48 ` Alexander Duyck
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