From: Michal Hocko <mhocko@kernel.org>
To: osalvador <osalvador@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Wei Yang <richard.weiyang@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: use managed_zone() for more exact check in zone iteration
Date: Fri, 16 Nov 2018 12:26:03 +0100 [thread overview]
Message-ID: <20181116112603.GI14706@dhcp22.suse.cz> (raw)
In-Reply-To: <1542366304.3020.15.camel@suse.de>
On Fri 16-11-18 12:05:04, osalvador wrote:
> On Fri, 2018-11-16 at 10:57 +0100, Michal Hocko wrote:
[...]
> > E.g. memory hotplug decreases both managed and present counters. I
> > am actually not sure that is 100% correct (put on my TODO list to
> > check). There is no consistency in that regards.
>
> We can only offline non-reserved pages (so, managed pages).
Yes
> Since present pages holds reserved_pages + managed_pages, decreasing
> both should be fine unless I am mistaken.
Well, present_pages is defined as "physical pages existing within the zone"
and those pages are still existing but they are offline. But as I've
said I have to think about it some more
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-11-16 11:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 23:50 Wei Yang
2018-11-15 21:37 ` Andrew Morton
2018-11-16 4:41 ` Wei Yang
2018-11-16 9:57 ` Michal Hocko
2018-11-16 11:05 ` osalvador
2018-11-16 11:26 ` Michal Hocko [this message]
2018-11-16 15:58 ` Wei Yang
2018-11-16 17:07 ` Michal Hocko
2018-11-16 10:24 ` Michal Hocko
2018-11-21 3:05 ` Wei Yang
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