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 <20210428094949.43579-8-songmuchun@bytedance.com> <20210429064751.GA2216380@infradead.org>
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From:   Muchun Song <songmuchun@bytedance.com>
Date:   Thu, 29 Apr 2021 15:36:13 +0800
Message-ID: <CAMZfGtVu7jVSD8DKze5dNoECN1RKnq4mdfT7ym3Ln1QStKSXJQ@mail.gmail.com>
Subject: Re: [External] Re: [PATCH 7/9] ida: introduce ida_max() to return the
 maximum allocated ID
To:     Christoph Hellwig <hch@infradead.org>
Cc:     Matthew Wilcox <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Shakeel Butt <shakeelb@google.com>,
        Roman Gushchin <guro@fb.com>, Yang Shi <shy828301@gmail.com>,
        alexs@kernel.org,
        Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        Wei Yang <richard.weiyang@gmail.com>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>
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On Thu, Apr 29, 2021 at 2:49 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Wed, Apr 28, 2021 at 05:49:47PM +0800, Muchun Song wrote:
> > Introduce ida_max() to return the maximum allocated ID. This will be
> > used by memory cgroup in the later patch.
>
> Please also add a lower-level xa_max as this funcationalty would also
> come in handy at the xarray level in a few places.

Good suggestion. This way is also efficient. Thanks.