From: "Li Xinhai" <lixinhai.lxh@gmail.com>
To: mhocko <mhocko@suse.com>
Cc: "Mike Kravetz" <mike.kravetz@oracle.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
akpm <akpm@linux-foundation.org>,
yang.shi <yang.shi@linux.alibaba.com>,
n-horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [PATCH 2/2] mm/mempolicy: Skip walking HUGETLB vma if MPOL_MF_STRICT is specified alone
Date: Wed, 22 Jan 2020 21:55:39 +0800 [thread overview]
Message-ID: <2020012221553734929840@gmail.com> (raw)
In-Reply-To: 20200121145344.GM29276@dhcp22.suse.cz
On 2020-01-21 at 22:53 Michal Hocko wrote:
>On Tue 21-01-20 22:15:43, Li Xinhai wrote:
>[...]
>> Knowing about misplaced pages from mbind will give me flexibility for
>> choosing different solutions.
>
>Would /proc/pid/numa_maps help to give you rough idea which mappings
>of interest have misplaced pages and move_pages for those? It is still
>allocating arrays but is that really a big deal?
numa_maps can be checked about misplaced pages, and I mentioned it in
previous mail for this purpose.
For my case, using move_pages() is necessary for later action. The only difference
is about mbind() could give feedback of misplaced page on impacted range,
numa_mpas requres me iterate over maps (that will collect states on those
maps although don't been used) to reach impacted range and check
it.
I may assume there is no much difference on overall performance, it is more
about coding effort in user sapce application.
I've being try to apply patch for mbind(i.e., apply STRICT on hugetlb mapping),
and may sharing it after verification and let's see if that is usable, thanks.
>--
>Michal Hocko
>SUSE Labs
next prev parent reply other threads:[~2020-01-22 13:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 9:16 [PATCH 1/2] mm/mempolicy: Checking hstate for hugetlbfs page in vma_migratable Li Xinhai
2020-01-14 9:16 ` [PATCH 2/2] mm/mempolicy: Skip walking HUGETLB vma if MPOL_MF_STRICT is specified alone Li Xinhai
2020-01-14 14:09 ` Li Xinhai
2020-01-14 18:27 ` Yang Shi
2020-01-15 1:07 ` Mike Kravetz
2020-01-15 1:24 ` Yang Shi
2020-01-15 4:28 ` Mike Kravetz
2020-01-15 5:23 ` Yang Shi
2020-01-15 7:36 ` Li Xinhai
2020-01-15 17:16 ` Yang Shi
2020-01-15 21:07 ` Mike Kravetz
2020-01-15 21:30 ` Yang Shi
2020-01-15 21:45 ` Mike Kravetz
2020-01-15 21:59 ` Yang Shi
2020-01-16 8:07 ` HORIGUCHI NAOYA(堀口 直也)
2020-01-16 15:32 ` Li Xinhai
2020-01-16 7:59 ` Michal Hocko
2020-01-16 19:22 ` Mike Kravetz
2020-01-17 2:32 ` Yang Shi
2020-01-17 2:38 ` Li Xinhai
2020-01-17 7:57 ` Michal Hocko
2020-01-17 12:05 ` Li Xinhai
2020-01-17 15:20 ` Michal Hocko
2020-01-17 15:46 ` Li Xinhai
2020-01-20 12:45 ` Michal Hocko
2020-01-21 14:15 ` Li Xinhai
2020-01-21 14:53 ` Michal Hocko
2020-01-22 13:55 ` Li Xinhai [this message]
2020-01-14 19:12 ` [PATCH 1/2] mm/mempolicy: Checking hstate for hugetlbfs page in vma_migratable Mike Kravetz
2020-01-15 1:25 ` Andrew Morton
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