linux-kernel - Re: [PATCH resend] memcg: introduce per-memcg reclaim interface

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Message-ID: <874k3d6vuq.fsf@vajain21.in.ibm.com>
Date:   Fri, 01 Apr 2022 14:09:25 +0530
From:   Vaibhav Jain <vaibhav@...ux.ibm.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jonathan Corbet <corbet@....net>, Yu Zhao <yuzhao@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Wei Xu <weixugc@...gle.com>, Greg Thelen <gthelen@...gle.com>,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [PATCH resend] memcg: introduce per-memcg reclaim interface


Yosry Ahmed <yosryahmed@...gle.com> writes:
> From: Shakeel Butt <shakeelb@...gle.com>
>
> Introduce an memcg interface to trigger memory reclaim on a memory cgroup.
<snip>

> +
> +	while (nr_reclaimed < nr_to_reclaim) {
> +		unsigned long reclaimed;
> +
> +		if (signal_pending(current))
> +			break;
> +
> +		reclaimed = try_to_free_mem_cgroup_pages(memcg,
> +						nr_to_reclaim - nr_reclaimed,
> +						GFP_KERNEL, true);
> +
> +		if (!reclaimed && !nr_retries--)
> +			break;
> +
> +		nr_reclaimed += reclaimed;

I think there should be a cond_resched() in this loop before
try_to_free_mem_cgroup_pages() to have better chances of reclaim
succeding early.

<snip>

-- 
Cheers
~ Vaibhav