linux-kernel - Re: [External] Re: [PATCH 7/9] ida: introduce ida

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Message-ID: <CAMZfGtVu7jVSD8DKze5dNoECN1RKnq4mdfT7ym3Ln1QStKSXJQ@mail.gmail.com>
Date:   Thu, 29 Apr 2021 15:36:13 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, Yang Shi <shy828301@...il.com>,
        alexs@...nel.org,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Wei Yang <richard.weiyang@...il.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [External] Re: [PATCH 7/9] ida: introduce ida_max() to return the
 maximum allocated ID

On Thu, Apr 29, 2021 at 2:49 PM Christoph Hellwig <hch@...radead.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.