From: Hugh Dickins <hughd@google.com>
To: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Matthew Wilcox <willy@infradead.org>,
David Hildenbrand <david@redhat.com>,
Alistair Popple <apopple@nvidia.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Rik van Riel <riel@surriel.com>,
Suren Baghdasaryan <surenb@google.com>,
Yu Zhao <yuzhao@google.com>, Greg Thelen <gthelen@google.com>,
Shakeel Butt <shakeelb@google.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 00/13] mm/munlock: rework of mlock+munlock page handling
Date: Wed, 9 Feb 2022 08:21:17 -0800 (PST) [thread overview]
Message-ID: <147388c6-eb7-5c58-79a-7a8279c27fd@google.com> (raw)
In-Reply-To: <YgPfX+/f0ksBpx6G@dhcp22.suse.cz>
On Wed, 9 Feb 2022, Michal Hocko wrote:
>
> So far I have only managed to read through the series and trying to put
> all the pieces together (so far I have given up on the THP part) and my
> undestanding is far from complete. But I have to say I like the general
> approach and overall simplification.
Many thanks for looking, Michal, and for all the positivity!
>
> The only thing that is not entirely clear to me at the moment is why you
> have chosen to ignore already mapped LOCKONFAULT pages. They will
> eventually get sorted out during the reclaim/migration but this can
> backfire if too many pages have been pre-faulted before LOCKONFAULT
> call. Maybe not an interesting case in the first place but I am still
> wondering why you have chosen that way.
I'm puzzled: what makes you think I'm ignoring already mapped LOCKONFAULT
pages? I'd consider that a bug.
It is the case, isn't it, that a VM_LOCKONFAULT area always has VM_LOCKED
set too? If I've got that wrong, yes, I'll need to revisit conditions.
>
> I will be off next couple of days and plan to revisit this afterwards
> (should time allow). Anyway thanks a lot Hugh!
> --
> Michal Hocko
> SUSE Labs
next prev parent reply other threads:[~2022-02-09 16:21 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-06 21:27 [PATCH 00/13] mm/munlock: rework of mlock+munlock page handling Hugh Dickins
2022-02-06 21:30 ` [PATCH 01/13] mm/munlock: delete page_mlock() and all its works Hugh Dickins
2022-02-09 18:31 ` Vlastimil Babka
2022-02-09 22:28 ` Hugh Dickins
2022-02-10 9:52 ` Vlastimil Babka
2022-02-14 6:52 ` Hugh Dickins
2022-02-14 6:59 ` [PATCH v2 " Hugh Dickins
2022-02-14 10:07 ` Vlastimil Babka
2022-02-06 21:32 ` [PATCH 02/13] mm/munlock: delete FOLL_MLOCK and FOLL_POPULATE Hugh Dickins
2022-02-10 11:35 ` Vlastimil Babka
2022-02-06 21:34 ` [PATCH 03/13] mm/munlock: delete munlock_vma_pages_all(), allow oomreap Hugh Dickins
2022-02-10 15:30 ` Vlastimil Babka
2022-02-06 21:36 ` [PATCH 04/13] mm/munlock: rmap call mlock_vma_page() munlock_vma_page() Hugh Dickins
2022-02-11 10:29 ` Vlastimil Babka
2022-02-14 7:05 ` [PATCH v2 " Hugh Dickins
2022-02-06 21:38 ` [PATCH 05/13] mm/munlock: replace clear_page_mlock() by final clearance Hugh Dickins
2022-02-11 11:42 ` Vlastimil Babka
2022-02-06 21:38 ` [PATCH 00/13] mm/munlock: rework of mlock+munlock page handling Matthew Wilcox
2022-02-07 18:20 ` Hugh Dickins
2022-02-06 21:40 ` [PATCH 06/13] mm/munlock: maintain page->mlock_count while unevictable Hugh Dickins
2022-02-11 12:27 ` Vlastimil Babka
2022-02-14 5:42 ` Hugh Dickins
2022-02-11 18:07 ` Vlastimil Babka
2022-02-14 6:28 ` Hugh Dickins
2022-02-06 21:42 ` [PATCH 07/13] mm/munlock: mlock_pte_range() when mlocking or munlocking Hugh Dickins
2022-02-11 16:45 ` Vlastimil Babka
2022-02-14 6:32 ` Hugh Dickins
2022-02-14 7:09 ` [PATCH v2 " Hugh Dickins
2022-02-06 21:43 ` [PATCH 08/13] mm/migrate: __unmap_and_move() push good newpage to LRU Hugh Dickins
2022-02-11 17:19 ` Vlastimil Babka
2022-02-06 21:45 ` [PATCH 09/13] mm/munlock: delete smp_mb() from __pagevec_lru_add_fn() Hugh Dickins
2022-02-11 17:43 ` Vlastimil Babka
2022-02-06 21:47 ` [PATCH 10/13] mm/munlock: mlock_page() munlock_page() batch by pagevec Hugh Dickins
2022-02-09 8:15 ` Geert Uytterhoeven
2022-02-09 15:45 ` Hugh Dickins
2022-02-11 18:26 ` Vlastimil Babka
2022-02-14 7:15 ` [PATCH v2 " Hugh Dickins
2022-02-06 21:49 ` [PATCH 11/13] mm/munlock: page migration needs mlock pagevec drained Hugh Dickins
2022-02-11 18:49 ` Vlastimil Babka
2022-02-14 5:34 ` Hugh Dickins
2022-02-14 7:17 ` [PATCH v2 " Hugh Dickins
2022-02-06 21:51 ` [PATCH 12/13] mm/thp: collapse_file() do try_to_unmap(TTU_BATCH_FLUSH) Hugh Dickins
2022-02-06 21:53 ` [PATCH 13/13] mm/thp: shrink_page_list() avoid splitting VM_LOCKED THP Hugh Dickins
[not found] ` <20220207033518.2602-1-hdanton@sina.com>
2022-02-07 18:46 ` [PATCH 07/13] mm/munlock: mlock_pte_range() when mlocking or munlocking Hugh Dickins
2022-02-09 15:35 ` [PATCH 00/13] mm/munlock: rework of mlock+munlock page handling Michal Hocko
2022-02-09 16:21 ` Hugh Dickins [this message]
2022-02-09 21:01 ` Michal Hocko
2022-02-09 22:59 ` Hugh Dickins
2022-02-10 7:49 ` Michal Hocko
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