linux-kernel - Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task

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Message-ID: <C3E8B434-BAEE-42A8-85AF-3B676C65B2A6@redhat.com>
Date:   Tue, 22 Nov 2022 09:23:29 -0500
From:   Benjamin Coddington <bcodding@...hat.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     David Howells <dhowells@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
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        "Martin K. Petersen" <martin.petersen@...cle.com>,
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Subject: Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task_frag

On 21 Nov 2022, at 17:32, Shuah Khan wrote:

> On 11/21/22 15:01, Benjamin Coddington wrote:
>> On 21 Nov 2022, at 16:43, Shuah Khan wrote:
>>
>>> On 11/21/22 14:40, Shuah Khan wrote:
>>>> On 11/21/22 07:34, Benjamin Coddington wrote:
>>>>> On 21 Nov 2022, at 8:56, David Howells wrote:
>>>>>
>>>>>> Benjamin Coddington <bcodding@...hat.com> wrote:
>>>>>>
>>>>>>> Since moving to memalloc_nofs_save/restore, SUNRPC has stopped setting the
>>>>>>> GFP_NOIO flag on sk_allocation which the networking system uses to decide
>>>>>>> when it is safe to use current->task_frag.
>>>>>>
>>>>>> Um, what's task_frag?
>>>>>
>>>>> Its a per-task page_frag used to coalesce small writes for networking -- see:
>>>>>
>>>>> 5640f7685831 net: use a per task frag allocator
>>>>>
>>>>> Ben
>>>>>
>>>>>
>>>>
>>>> I am not seeing this in the mainline. Where can find this commit?
>>>>
>>>
>>> Okay. I see this commit in the mainline. However, I don't see the
>>> sk_use_task_frag in mainline.
>>
>> sk_use_task_frag is in patch 1/3 in this posting.
>>
>> https://lore.kernel.org/netdev/26d98c8f-372b-b9c8-c29f-096cddaff149@linuxfoundation.org/T/#m3271959c4cf8dcff1c0c6ba023b2b3821d9e7e99
>>
>
> Aha. I don't have 1/3 in my Inbox - I think it would make
> sense to cc people on the first patch so we can understand
> the premise for the change.

Yeah, I can do that if it goes to another version, I was just trying to be
considerate of all the noise this sort of posting generates.

Ben