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

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Message-ID: <20190201024310.GC26359@bombadil.infradead.org>
Date:   Thu, 31 Jan 2019 18:43:10 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Tobin C. Harding" <tobin@...nel.org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slab: Increase width of first /proc/slabinfo column

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.

Let me know if you can't find that and I'll try to dig it up.