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Re: [RFC PATCH 16/30] mm: enable slab allocation tagging for kmalloc and friends
- To: Suren Baghdasaryan <surenb@xxxxxxxxxx>
- From: Roman Gushchin <roman.gushchin@xxxxxxxxx>
- Date: Thu, 1 Sep 2022 16:50:10 -0700
- Cc: akpm@xxxxxxxxxxxxxxxxxxxx, kent.overstreet@xxxxxxxxx, mhocko@xxxxxxxx, vbabka@xxxxxxx, hannes@xxxxxxxxxxx, mgorman@xxxxxxx, dave@xxxxxxxxxxxx, willy@xxxxxxxxxxxxx, liam.howlett@xxxxxxxxxx, void@xxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, juri.lelli@xxxxxxxxxx, ldufour@xxxxxxxxxxxxx, peterx@xxxxxxxxxx, david@xxxxxxxxxx, axboe@xxxxxxxxx, mcgrof@xxxxxxxxxx, masahiroy@xxxxxxxxxx, nathan@xxxxxxxxxx, changbin.du@xxxxxxxxx, ytcoode@xxxxxxxxx, vincent.guittot@xxxxxxxxxx, dietmar.eggemann@xxxxxxx, rostedt@xxxxxxxxxxx, bsegall@xxxxxxxxxx, bristot@xxxxxxxxxx, vschneid@xxxxxxxxxx, cl@xxxxxxxxx, penberg@xxxxxxxxxx, iamjoonsoo.kim@xxxxxxx, 42.hyeyoo@xxxxxxxxx, glider@xxxxxxxxxx, elver@xxxxxxxxxx, dvyukov@xxxxxxxxxx, shakeelb@xxxxxxxxxx, songmuchun@xxxxxxxxxxxxx, arnd@xxxxxxxx, jbaron@xxxxxxxxxx, rientjes@xxxxxxxxxx, minchan@xxxxxxxxxx, kaleshsingh@xxxxxxxxxx, kernel-team@xxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, io-uring@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, linux-modules@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 02 Sep 2022 05:28:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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!
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