linux-kernel - Re: [PATCH] nvme: Drop WQ_MEM_RECLAIM flag from core workqueues

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Message-ID: <20210413133512.GH227011@ziepe.ca>
Date:   Tue, 13 Apr 2021 10:35:12 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Steve Wise <swise@...ngridcomputing.com>,
        Leon Romanovsky <leon@...nel.org>,
        Potnuri Bharat Teja <bharat@...lsio.com>
Subject: Re: [PATCH] nvme: Drop WQ_MEM_RECLAIM flag from core workqueues

On Tue, Apr 13, 2021 at 10:54:04AM +0200, Daniel Wagner wrote:

> Hmm, I am struggling with your last statement. If a worker does an
> allocation it might block. I understand this is something which a worker
> in a WQ_MEM_RECLAIM context is not allowed to do.
> 
> My aim is still to get rid of the warning triggered by the rdma
> code.

The WQ_MEM_RECLAIM is placed on a workqueue not because of what is
*inside* the work, but because of what is *waiting* on the work.

Jason