linux-kernel - Re: [PATCH] fs: inode: Recycle inodenum from volatile inode slabs

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Date:   Fri, 27 Dec 2019 11:37:32 +0000
From:   Chris Down <chris@...isdown.name>
To:     "zhengbin (A)" <zhengbin13@...wei.com>
Cc:     Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Jeff Layton <jlayton@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, kernel-team@...com
Subject: Re: [PATCH] fs: inode: Recycle inodenum from volatile inode slabs

zhengbin (A) writes:
>How about tmpfs and hugetlbfs use their own get_next_ino? like
>
>static DEFINE_PER_CPU(unsigned int, tmpfs_last_ino),
>
>which can reduce the risk of 32 bit wraparound further.

This won't help by itself, because in the case presented the wraparound almost 
solely comes from shmem alone.