netdev - Re: [PATCH] net: dccp: Replace GFP_ATOMIC with GFP_KERNEL in dccp

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Message-ID: <ab55c4a7-ee67-eead-eeeb-4dc92eaf9aee@gmail.com>
Date:   Mon, 9 Apr 2018 22:46:05 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>, gerrit@....abdn.ac.uk,
        davem@...emloft.net
Cc:     dccp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dccp: Replace GFP_ATOMIC with GFP_KERNEL in
 dccp_init



On 2018/4/9 22:42, Eric Dumazet wrote:
>
> On 04/09/2018 07:10 AM, Jia-Ju Bai wrote:
>> dccp_init() is never called in atomic context.
>> This function is only set as a parameter of module_init().
>>
>> Despite never getting called from atomic context,
>> dccp_init() calls __get_free_pages() with GFP_ATOMIC,
>> which waits busily for allocation.
> What do you mean by "waits busily" ?
>
> GFP_ATOMIC does not sleep, does not wait.

Sorry, I should modify it to "does not sleep".
Do you think it is okay?


Best wishes,
Jia-Ju Bai