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Date:   Mon, 21 Nov 2022 15:32:02 -0700
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Subject: Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task_frag
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To:     Benjamin Coddington <bcodding@redhat.com>
Cc:     David Howells <dhowells@redhat.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Philipp Reisner <philipp.reisner@linbit.com>,
        Lars Ellenberg <lars.ellenberg@linbit.com>,
        =?UTF-8?Q?Christoph_B=c3=b6hmwalder?= 
        <christoph.boehmwalder@linbit.com>, Jens Axboe <axboe@kernel.dk>,
        Josef Bacik <josef@toxicpanda.com>,
        Keith Busch <kbusch@kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Lee Duncan <lduncan@suse.com>, Chris Leech <cleech@redhat.com>,
        Mike Christie <michael.christie@oracle.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Valentina Manea <valentina.manea.m@gmail.com>,
        Shuah Khan <shuah@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Marc Dionne <marc.dionne@auristor.com>,
        Steve French <sfrench@samba.org>,
        Christine Caulfield <ccaulfie@redhat.com>,
        David Teigland <teigland@redhat.com>,
        Mark Fasheh <mark@fasheh.com>,
        Joel Becker <jlbec@evilplan.org>,
        Joseph Qi <joseph.qi@linux.alibaba.com>,
        Eric Van Hensbergen <ericvh@gmail.com>,
        Latchesar Ionkov <lucho@ionkov.net>,
        Dominique Martinet <asmadeus@codewreck.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Ilya Dryomov <idryomov@gmail.com>,
        Xiubo Li <xiubli@redhat.com>,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Anna Schumaker <anna@kernel.org>,
        Chuck Lever <chuck.lever@oracle.com>,
        Jeff Layton <jlayton@kernel.org>, drbd-dev@lists.linbit.com,
        linux-block@vger.kernel.org, nbd@other.debian.org,
        linux-nvme@lists.infradead.org, open-iscsi@googlegroups.com,
        linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org,
        linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org,
        samba-technical@lists.samba.org, cluster-devel@redhat.com,
        ocfs2-devel@oss.oracle.com, v9fs-developer@lists.sourceforge.net,
        ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org,
        Shuah Khan <skhan@linuxfoundation.org>
References: <c2ec184226acd21a191ccc1aa46a1d7e43ca7104.1669036433.git.bcodding@redhat.com>
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 <A860595D-5BAB-461B-B449-8975C0424311@redhat.com>
From:   Shuah Khan <skhan@linuxfoundation.org>
In-Reply-To: <A860595D-5BAB-461B-B449-8975C0424311@redhat.com>
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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@redhat.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.

thanks,
-- Shuah