linux-kernel - Re: [PATCH v2 0/5] mm: support parallel free of memory

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Message-ID: <20170316141437.GA16038@aaronlu.sh.intel.com>
Date:   Thu, 16 Mar 2017 22:14:38 +0800
From:   Aaron Lu <aaron.lu@...el.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Michal Hocko <mhocko@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ying Huang <ying.huang@...el.com>
Subject: Re: [PATCH v2 0/5] mm: support parallel free of memory

On Thu, Mar 16, 2017 at 09:51:22PM +0800, Aaron Lu wrote:
> Considering that we are mostly improving for memory intensive apps, the
> default setting should probably be: max_active = node_number with each
> worker freeing 2G memory.

In case people want to give this setting a try, here is what to do.

On 2-nodes EP:
# echo 2 > /sys/devices/virtual/workqueue/batch_free_wq/max_active
# echo 1030 > /sys/kernel/debug/parallel_free/max_gather_batch_count

On 4-nodes EX:
# echo 4 > /sys/devices/virtual/workqueue/batch_free_wq/max_active
# echo 1030 > /sys/kernel/debug/parallel_free/max_gather_batch_count