linux-kernel - Re: [PATCH v5 0/4] Charge loop device i/o to issuing cgroup

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Message-ID: <20200527050922.GB31860@infradead.org>
Date:   Tue, 26 May 2020 22:09:22 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dan Schatzberg <schatzberg.dan@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>, Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Chris Down <chris@...isdown.name>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "open list:BLOCK LAYER" <linux-block@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <linux-mm@...ck.org>
Subject: Re: [PATCH v5 0/4] Charge loop device i/o to issuing cgroup

On Tue, May 26, 2020 at 10:28:03AM -0400, Dan Schatzberg wrote:
> Will do - I'll split out the lock-use refactor into a separate
> patch. Do you have particular concerns about re-using the existing
> spinlock? Its existing use is not contended so I didn't see any harm
> in extending its use. I'll add this justification to the commit
> message as well, but I'm tempted to leave the re-use as is instead of
> creating a new lock.

Please don't share a lock for entirely separate critical sections that
are used from different contexts.