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From: Qian Cai <cai@lca.pw>
To: Anshuman Khandual <Anshuman.Khandual@arm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>, Vlastimil Babka <vbabka@suse.cz>,
	Oscar Salvador <osalvador@suse.de>,
	Mel Gorman <mgorman@techsingularity.net>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Pavel Tatashin <pavel.tatashin@microsoft.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Add a reason for reserved pages in has_unmovable_pages()
Date: Thu, 3 Oct 2019 07:50:31 -0400
Message-ID: <983E7EA4-A022-448C-B11D-8C10441A2E07@lca.pw> (raw)
In-Reply-To: <d3a88afd-63c6-1091-cf4c-75cd10b7f547@arm.com>



> On Oct 3, 2019, at 7:31 AM, Anshuman Khandual <Anshuman.Khandual@arm.com> wrote:
> 
> Ohh, never meant that the 'Reserved' bit is anything special here but it
> is a reason to make a page unmovable unlike many other flags.

But dump_page() is used everywhere, and it is better to reserve “reason” to indicate something more important rather than duplicating the page flags.

Especially, it is trivial enough right now for developers look in the page flags dumping from has_unmovable_pages(), and figure out the exact branching in the code.

  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-03  8:10 Anshuman Khandual
2019-10-03  9:05 ` Qian Cai
2019-10-03  9:32   ` Anshuman Khandual
2019-10-03  9:53     ` Anshuman Khandual
2019-10-03 11:19     ` Qian Cai
2019-10-03 11:32       ` Anshuman Khandual
2019-10-03 11:50         ` Qian Cai [this message]
2019-10-03 12:02           ` Anshuman Khandual
2019-10-03 12:14             ` Qian Cai
2019-10-04  8:25               ` David Hildenbrand
2020-01-14  8:19                 ` Anshuman Khandual
2020-01-14  8:30                   ` David Hildenbrand
2020-01-14  9:10                   ` Michal Hocko
2020-01-14 10:23                     ` Vlastimil Babka
2020-01-14 11:03                       ` Anshuman Khandual
2020-01-14 11:32                       ` Michal Hocko
2020-01-14 12:04                         ` [PATCH] mm, debug: always print flags in dump_page() Vlastimil Babka
2020-01-14 13:35                           ` Michal Hocko
2020-01-14 18:22                         ` [PATCH] mm/page_alloc: Add a reason for reserved pages in has_unmovable_pages() Ralph Campbell
2019-10-04 10:58 ` Michal Hocko
2019-10-04 11:44   ` Anshuman Khandual
2019-10-04 12:56     ` Qian Cai
2019-10-04 13:07       ` Michal Hocko
2019-10-04 13:30         ` Qian Cai
2019-10-04 13:38           ` Michal Hocko
2019-10-04 13:56             ` Qian Cai
2019-10-04 14:41               ` Michal Hocko
2019-10-05 21:22                 ` Andrew Morton
2019-10-05 22:38                   ` Qian Cai

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