linux-kernel - Re: [RFC PATCH 16/30] mm: enable slab allocation tagging for kmalloc and friends

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Message-ID: <YxFFMtvI/J3VN3pl@P9FQF9L96D.corp.robot.car>
Date:   Thu, 1 Sep 2022 16:50:10 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Suren Baghdasaryan <surenb@...gle.com>
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Subject: Re: [RFC PATCH 16/30] mm: enable slab allocation tagging for kmalloc
 and friends

On Tue, Aug 30, 2022 at 02:49:05PM -0700, Suren Baghdasaryan wrote:
> Redefine kmalloc, krealloc, kzalloc, kcalloc, etc. to record allocations
> and deallocations done by these functions.

One particular case when this functionality might be very useful:
in the past we've seen examples (at Fb) where it was hard to understand
the difference between slab memory sizes of two different kernel versions
due to slab caches merging. Once a slab cache is merged with another large
cache, this data is pretty much lost. So I definetely see value in stats which
are independent from kmem caches.

The performance overhead is a concern here, so more data would be useful.

Thanks!