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
next prev parent 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 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
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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