From: Yu Zhao <yuzhao@google.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: akpm@linux-foundation.org, alex.shi@linux.alibaba.com,
willy@infradead.org, guro@fb.com, hannes@cmpxchg.org,
hughd@google.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mhocko@kernel.org, vdavydov.dev@gmail.com,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v2 0/3] trim the uses of compound_head()
Date: Fri, 26 Feb 2021 12:04:07 -0700 [thread overview]
Message-ID: <YDlGJ4eRPCNWESkj@google.com> (raw)
In-Reply-To: <bd876842-b1e6-66fd-da1a-b181cede101a@suse.cz>
On Fri, Feb 26, 2021 at 11:52:03AM +0100, Vlastimil Babka wrote:
> On 2/26/21 10:17 AM, Yu Zhao wrote:
> > Patch series "mm: lru related cleanups" starting at commit 42895ea73bcd
> > ("mm/vmscan.c: use add_page_to_lru_list()") bloated vmlinux by 1777
> > bytes, according to:
> > https://lore.kernel.org/linux-mm/85b3e8f2-5982-3329-c20d-cf062b8da71e@suse.cz/
>
> Huh, I thought Andrew didn't want to send it for 5.12:
> https://lore.kernel.org/linux-mm/20210223145011.0181eed96ab0091a493b51f6@linux-foundation.org/
>
> > It turned out many places inline Page{Active,Unevictable} which in
> > turn include compound_head().
> >
> > From the v1:
> > Removing compound_head() entirely from Page{Active,Unevictable} may
> > not be the best option (for the moment) because there may be other
> > cases that need compound_head().
> >
> > In addition to picking a couple pieces of low-hanging fruit, this v2
> > removes compound_head() completely from Page{Active,Unevictable}.
> >
> > bloat-o-meter result before and after the series:
> > add/remove: 0/0 grow/shrink: 6/92 up/down: 697/-7656 (-6959)
>
> Good that you found a way to more than undo the bloat then. But we need to be
> careful so bugs are not introduced due to pressure to not have bloated 5.12.
I was very conservative and only picked a few pieces of low-hanging
fruit. The pressure is good -- if you hadn't noticed it and Andrew
hadn't been emphatic about it, it'd have been left for another time
and to another person, and so on.
prev parent reply other threads:[~2021-02-26 19:05 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-22 22:05 [PATCH v2 00/10] mm: lru related cleanups Yu Zhao
2021-01-22 22:05 ` [PATCH v2 01/10] mm: use add_page_to_lru_list() Yu Zhao
2021-01-26 18:57 ` Vlastimil Babka
2021-01-27 2:12 ` Miaohe Lin
2021-01-22 22:05 ` [PATCH v2 02/10] mm: shuffle lru list addition and deletion functions Yu Zhao
2021-01-26 18:58 ` Vlastimil Babka
2021-01-27 2:14 ` Miaohe Lin
2021-01-22 22:05 ` [PATCH v2 03/10] mm: don't pass "enum lru_list" to lru list addition functions Yu Zhao
2021-01-26 19:13 ` Vlastimil Babka
2021-01-26 21:34 ` Yu Zhao
2021-01-27 10:51 ` Vlastimil Babka
2021-01-26 22:01 ` Matthew Wilcox
2021-01-26 22:14 ` Yu Zhao
2021-02-23 22:50 ` Andrew Morton
2021-02-24 5:29 ` Yu Zhao
2021-02-24 8:06 ` Alex Shi
2021-02-24 8:37 ` Yu Zhao
2021-02-24 9:01 ` Alex Shi
2021-01-22 22:05 ` [PATCH v2 04/10] mm: don't pass "enum lru_list" to trace_mm_lru_insertion() Yu Zhao
2021-01-22 22:05 ` [PATCH v2 05/10] mm: don't pass "enum lru_list" to del_page_from_lru_list() Yu Zhao
2021-01-22 22:05 ` [PATCH v2 06/10] mm: add __clear_page_lru_flags() to replace page_off_lru() Yu Zhao
2021-01-22 22:05 ` [PATCH v2 07/10] mm: VM_BUG_ON lru page flags Yu Zhao
2021-01-22 22:05 ` [PATCH v2 08/10] mm: fold page_lru_base_type() into its sole caller Yu Zhao
2021-01-22 22:05 ` [PATCH v2 09/10] mm: fold __update_lru_size() " Yu Zhao
2021-01-22 22:06 ` [PATCH v2 10/10] mm: make lruvec_lru_size() static Yu Zhao
2021-02-24 8:48 ` [PATCH] mm: test page->flags directly in page_lru() Yu Zhao
2021-02-24 13:15 ` Andrew Morton
2021-02-24 19:57 ` Yu Zhao
2021-02-24 21:56 ` Matthew Wilcox
2021-02-24 22:34 ` Yu Zhao
2021-02-24 22:48 ` Matthew Wilcox
2021-02-24 23:50 ` Yu Zhao
2021-02-25 3:55 ` Matthew Wilcox
2021-02-25 5:22 ` Yu Zhao
2021-02-25 12:12 ` Matthew Wilcox
2021-02-26 9:17 ` [PATCH v2 0/3] trim the uses of compound_head() Yu Zhao
2021-02-26 9:17 ` [PATCH v2 1/3] mm: bypass compound_head() for PF_NO_TAIL when enforce=1 Yu Zhao
2021-02-26 9:17 ` [PATCH v2 2/3] mm: use PF_NO_TAIL for PG_lru Yu Zhao
2021-02-26 20:22 ` Yu Zhao
2021-02-26 9:17 ` [PATCH v2 3/3] mm: use PF_ONLY_HEAD for PG_active and PG_unevictable Yu Zhao
2021-02-26 12:13 ` Matthew Wilcox
2021-02-26 19:49 ` Yu Zhao
2021-02-26 20:27 ` Matthew Wilcox
2021-03-01 11:50 ` Kirill A. Shutemov
2021-03-01 19:58 ` Yu Zhao
2021-03-01 20:16 ` Hugh Dickins
2021-03-01 20:26 ` Matthew Wilcox
2021-02-26 10:52 ` [PATCH v2 0/3] trim the uses of compound_head() Vlastimil Babka
2021-02-26 19:04 ` Yu Zhao [this message]
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