linux-kernel - Re: CMA allocation failure and Latency issue

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Message-ID: <20190307080940.GL4603@dhcp22.suse.cz>
Date:   Thu, 7 Mar 2019 09:09:40 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Pankaj Suryawanshi <suryawanshipankaj@...oo.com>
Cc:     s.szyprowski@...sung.com, mina86@...a86.com, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: CMA allocation failure and Latency issue


[Cc linux-mm and lkml]

Please do not use html emails, thanks!

On Thu 07-03-19 13:28:59, Pankaj Suryawanshi wrote:
> Hello,
> 
> I am facing issue related to CMA allocation failure of large size buffer.
> 
> I am beginner in Linux memory management. So I need your help to debug the
> issue, 
> 
> I have below questions 
> 
> 1. Why migration failed
> 2. Who pinned the pages, Which process pinned ,how to know ?
> 3. How to migrate pages forcefully so failure will avoid.(not preferable
> approach)
> etc.
> 
> Any help would be appreciated.
> 
> Please let me know if you require further information.
> 
> Regards,
> Pankaj

-- 
Michal Hocko
SUSE Labs