linux-kernel - Re: [PATCH] mm/slab: Increase width of first /proc/slabinfo column

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Message-Id: <20190201140346.fdcd6c4b663fbe3b5d93820d@linux-foundation.org>
Date:   Fri, 1 Feb 2019 14:03:46 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Tobin C. Harding" <tobin@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slab: Increase width of first /proc/slabinfo column

On Thu, 31 Jan 2019 18:43:10 -0800 Matthew Wilcox <willy@...radead.org> wrote:

> On Fri, Feb 01, 2019 at 11:42:42AM +1100, Tobin C. Harding wrote:
> > Currently when displaying /proc/slabinfo if any cache names are too long
> > then the output columns are not aligned.  We could do something fancy to
> > get the maximum length of any cache name in the system or we could just
> > increase the hardcoded width.  Currently it is 17 characters.  Monitors
> > are wide these days so lets just increase it to 30 characters.
> 
> I had a proposal some time ago to turn the slab name from being kmalloced
> to being an inline 16 bytes (with some fun hacks for cgroups).  I think
> that's a better approach than permitting such long names.  For example,
> ext4_allocation_context could be shortened to ext4_alloc_ctx without
> losing any expressivity.
> 

There are some back-compatibility concerns here.  And truncating long
names might result in duplicates.