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From: Feng Tang <feng.tang@intel.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Matthew Wilcox <willy@infradead.org>,
	Mel Gorman <mgorman@suse.de>, Kees Cook <keescook@chromium.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Iurii Zaikin <yzaikin@google.com>,
	"Kleen, Andi" <andi.kleen@intel.com>,
	"Chen, Tim C" <tim.c.chen@intel.com>,
	"Hansen, Dave" <dave.hansen@intel.com>,
	"Huang, Ying" <ying.huang@intel.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] mm/util.c: make vm_memory_committed() more accurate
Date: Fri, 15 May 2020 21:01:07 +0800	[thread overview]
Message-ID: <20200515130107.GG69177@shbuild999.sh.intel.com> (raw)
In-Reply-To: <20200515090440.GN29153@dhcp22.suse.cz>

On Fri, May 15, 2020 at 05:04:40PM +0800, Michal Hocko wrote:
> On Fri 15-05-20 16:11:09, Feng Tang wrote:
> > On Fri, May 15, 2020 at 03:23:07PM +0800, Michal Hocko wrote:
> > > On Fri 08-05-20 15:25:16, Feng Tang wrote:
> > > > percpu_counter_sum_positive() will provide more accurate info.
> > > 
> > > Why do we need that?
> > 
> > This is a preparation for patch 3/3, which will enlarge the batch size
> > of percpu-counter 'vm_committed_as'. Andi Kleen concerned that may
> > hurt the accuracy for those readers (currently only /proc/meminfo
> > and hyperV balloon drivers for status check)
> > 
> > As in worst case, the deviation could be 'batch * nr_cpus', and
> > with patch 3/3, that could be totalram_pages/16.
> 
> This information belongs to the changelog.

Will add it in v3, thanks

- Feng

  reply	other threads:[~2020-05-15 13:01 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-08  7:25 [PATCH 0/3] make vm_committed_as_batch aware of vm overcommit policy Feng Tang
2020-05-08  7:25 ` [PATCH 1/3] proc/meminfo: avoid open coded reading of vm_committed_as Feng Tang
2020-05-15  7:22   ` Michal Hocko
2020-05-08  7:25 ` [PATCH 2/3] mm/util.c: make vm_memory_committed() more accurate Feng Tang
2020-05-15  7:23   ` Michal Hocko
2020-05-15  8:11     ` Feng Tang
2020-05-15  9:04       ` Michal Hocko
2020-05-15 13:01         ` Feng Tang [this message]
2020-05-08  7:25 ` [PATCH 3/3] mm: adjust vm_committed_as_batch according to vm overcommit policy Feng Tang
2020-05-08 11:24   ` Matthew Wilcox
2020-05-08 12:33     ` Feng Tang
2020-05-15  7:41   ` Michal Hocko
2020-05-15  8:02     ` Feng Tang
2020-05-15  9:08       ` Michal Hocko
2020-05-15 11:26         ` Feng Tang
2020-05-15  7:44   ` Michal Hocko
2020-05-15  8:38     ` Feng Tang
2020-05-21 21:27 ` [PATCH 0/3] make vm_committed_as_batch aware of " Qian Cai
2020-05-26 18:14   ` Qian Cai
2020-05-27  1:14     ` Andi Kleen
2020-05-27  1:43       ` Feng Tang
2020-05-27  1:46     ` Feng Tang
2020-05-27  2:25       ` Qian Cai
2020-05-27 10:46         ` Feng Tang
2020-05-27 12:05           ` Qian Cai
2020-05-27 13:33             ` Feng Tang
2020-05-27 15:42               ` Qian Cai
2020-05-28 14:18           ` Qian Cai
2020-05-28 15:10             ` Feng Tang
2020-05-28 15:21               ` Kleen, Andi
2020-05-29 15:43                 ` Feng Tang
2020-05-29 15:50                   ` Andi Kleen
2020-05-29 16:04                     ` Feng Tang
2020-05-28 15:48               ` Michal Hocko

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