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From: Feng Tang <feng.tang@intel.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.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 3/3] mm: adjust vm_committed_as_batch according to vm overcommit policy
Date: Fri, 8 May 2020 20:33:33 +0800	[thread overview]
Message-ID: <20200508123333.GA69441@shbuild999.sh.intel.com> (raw)
In-Reply-To: <20200508112448.GP16070@bombadil.infradead.org>

On Fri, May 08, 2020 at 07:24:48PM +0800, Matthew Wilcox wrote:
> On Fri, May 08, 2020 at 03:25:17PM +0800, Feng Tang wrote:
> > +void mm_compute_batch(void)
> >  {
> >  	u64 memsized_batch;
> >  	s32 nr = num_present_cpus();
> >  	s32 batch = max_t(s32, nr*2, 32);
> > -
> > -	/* batch size set to 0.4% of (total memory/#cpus), or max int32 */
> > -	memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff);
> > +	unsigned long ram_pages = totalram_pages();
> > +
> > +	/*
> > +	 * For policy of OVERCOMMIT_NEVER, set batch size to 0.4%
> > +	 * of (total memory/#cpus), and lift it to 6.25% for other
> > +	 * policies to easy the possible lock contention for percpu_counter
> > +	 * vm_committed_as, while the max limit is INT_MAX
> > +	 */
> > +	if (sysctl_overcommit_memory == OVERCOMMIT_NEVER)
> > +		memsized_batch = min_t(u64, ram_pages/nr/256, INT_MAX);
> > +	else
> > +		memsized_batch = min_t(u64, ram_pages/nr/16, INT_MAX);
> >  
> >  	vm_committed_as_batch = max_t(s32, memsized_batch, batch);
> > +	printk("vm_committed_as_batch = %d\n", vm_committed_as_batch);
> >  }
> 
> You left a debugging printk in ...

Yep, my bad, thanks for the catching, will remove it.

- Feng

  reply	other threads:[~2020-05-08 12:33 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 " 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
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 [this message]
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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