From: Michal Hocko <mhocko@kernel.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-api@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>,
Tim Murray <timmurray@google.com>,
Joel Fernandes <joel@joelfernandes.org>,
Suren Baghdasaryan <surenb@google.com>,
Daniel Colascione <dancol@google.com>,
Shakeel Butt <shakeelb@google.com>,
Sonny Rao <sonnyrao@google.com>,
Brian Geffon <bgeffon@google.com>,
jannh@google.com, oleg@redhat.com, christian@brauner.io,
oleksandr@redhat.com, hdanton@sina.com, lizeb@google.com
Subject: Re: [PATCH v2 2/5] mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM
Date: Wed, 19 Jun 2019 15:09:44 +0200 [thread overview]
Message-ID: <20190619130943.GP2968@dhcp22.suse.cz> (raw)
In-Reply-To: <20190610111252.239156-3-minchan@kernel.org>
On Mon 10-06-19 20:12:49, Minchan Kim wrote:
> The local variable references in shrink_page_list is PAGEREF_RECLAIM_CLEAN
> as default. It is for preventing to reclaim dirty pages when CMA try to
> migrate pages. Strictly speaking, we don't need it because CMA didn't allow
> to write out by .may_writepage = 0 in reclaim_clean_pages_from_list.
>
> Moreover, it has a problem to prevent anonymous pages's swap out even
> though force_reclaim = true in shrink_page_list on upcoming patch.
> So this patch makes references's default value to PAGEREF_RECLAIM and
> rename force_reclaim with ignore_references to make it more clear.
>
> This is a preparatory work for next patch.
>
> * RFCv1
> * use ignore_referecnes as parameter name - hannes
>
> Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Minchan Kim <minchan@kernel.org>
The code path is quite tricky to follow but the patch looks OK to me.
Acked-by: Michal Hocko <mhocko@suse.com>
> ---
> mm/vmscan.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 84dcb651d05c..0973a46a0472 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1102,7 +1102,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> struct scan_control *sc,
> enum ttu_flags ttu_flags,
> struct reclaim_stat *stat,
> - bool force_reclaim)
> + bool ignore_references)
> {
> LIST_HEAD(ret_pages);
> LIST_HEAD(free_pages);
> @@ -1116,7 +1116,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> struct address_space *mapping;
> struct page *page;
> int may_enter_fs;
> - enum page_references references = PAGEREF_RECLAIM_CLEAN;
> + enum page_references references = PAGEREF_RECLAIM;
> bool dirty, writeback;
> unsigned int nr_pages;
>
> @@ -1247,7 +1247,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> }
> }
>
> - if (!force_reclaim)
> + if (!ignore_references)
> references = page_check_references(page, sc);
>
> switch (references) {
> --
> 2.22.0.rc2.383.gf4fbbf30c2-goog
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-06-19 13:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-10 11:12 [PATCH v2 0/5] Introduce MADV_COLD and MADV_PAGEOUT Minchan Kim
2019-06-10 11:12 ` [PATCH v2 1/5] mm: introduce MADV_COLD Minchan Kim
2019-06-19 12:56 ` Michal Hocko
2019-06-20 0:06 ` Minchan Kim
2019-06-20 7:08 ` Michal Hocko
2019-06-20 8:44 ` Minchan Kim
2019-06-10 11:12 ` [PATCH v2 2/5] mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM Minchan Kim
2019-06-19 13:09 ` Michal Hocko [this message]
2019-06-10 11:12 ` [PATCH v2 3/5] mm: account nr_isolated_xxx in [isolate|putback]_lru_page Minchan Kim
2019-06-10 11:12 ` [PATCH v2 4/5] mm: introduce MADV_PAGEOUT Minchan Kim
2019-06-19 13:24 ` Michal Hocko
2019-06-20 4:16 ` Minchan Kim
2019-06-20 7:04 ` Michal Hocko
2019-06-20 8:40 ` Minchan Kim
2019-06-20 9:22 ` Michal Hocko
2019-06-20 10:32 ` Minchan Kim
2019-06-20 10:55 ` Michal Hocko
2019-06-10 11:12 ` [PATCH v2 5/5] mm: factor out pmd young/dirty bit handling and THP split Minchan Kim
2019-06-10 18:03 ` [PATCH v2 0/5] Introduce MADV_COLD and MADV_PAGEOUT Dave Hansen
2019-06-13 4:51 ` Minchan Kim
2019-06-12 10:59 ` Pavel Machek
2019-06-12 11:19 ` Oleksandr Natalenko
2019-06-12 11:37 ` Pavel Machek
2019-06-19 12:27 ` Michal Hocko
2019-06-19 23:42 ` Minchan Kim
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