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Date: Mon, 22 Feb 2021 07:09:41 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Alexey Gladkov <gladkov.alexey@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>, io-uring@...r.kernel.org,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux Containers <containers@...ts.linux-foundation.org>,
linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
Christian Brauner <christian.brauner@...ntu.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>, Jann Horn <jannh@...gle.com>,
Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v6 3/7] Reimplement RLIMIT_NPROC on top of ucounts
On 2/22/21 3:11 AM, Alexey Gladkov wrote:
> On Sun, Feb 21, 2021 at 04:38:10PM -0700, Jens Axboe wrote:
>> On 2/15/21 5:41 AM, Alexey Gladkov wrote:
>>> diff --git a/fs/io-wq.c b/fs/io-wq.c
>>> index a564f36e260c..5b6940c90c61 100644
>>> --- a/fs/io-wq.c
>>> +++ b/fs/io-wq.c
>>> @@ -1090,10 +1091,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
>>> wqe->node = alloc_node;
>>> wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
>>> atomic_set(&wqe->acct[IO_WQ_ACCT_BOUND].nr_running, 0);
>>> - if (wq->user) {
>>> - wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
>>> - task_rlimit(current, RLIMIT_NPROC);
>>> - }
>>> + wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers = task_rlimit(current, RLIMIT_NPROC);
>>
>> This doesn't look like an equivalent transformation. But that may be
>> moot if we merge the io_uring-worker.v3 series, as then you would not
>> have to touch io-wq at all.
>
> In the current code the wq->user is always set to current_user():
>
> io_uring_create [1]
> `- io_sq_offload_create
> `- io_init_wq_offload [2]
> `-io_wq_create [3]
current vs other wasn't my concern, but we're always setting ->user so
the test was pointless. So looks fine to me.
--
Jens Axboe
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