linux-kernel - Re: [PATCH v10-mte 7/7] arm64: mte: implement CONFIG_ARM64_MTE_SWAP

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Date: Thu, 14 Dec 2023 12:21:33 -0800
From: Yury Norov <yury.norov@...il.com>
To: Alexander Potapenko <glider@...gle.com>
Cc: catalin.marinas@....com, will@...nel.org, pcc@...gle.com,
	andreyknvl@...il.com, andriy.shevchenko@...ux.intel.com,
	aleksander.lobakin@...el.com, linux@...musvillemoes.dk,
	alexandru.elisei@....com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, eugenis@...gle.com,
	syednwaris@...il.com, william.gray@...aro.org
Subject: Re: [PATCH v10-mte 7/7] arm64: mte: implement
 CONFIG_ARM64_MTE_SWAP_STATS

On Thu, Dec 14, 2023 at 12:06:39PM +0100, Alexander Potapenko wrote:
> Provide a config to collect the usage statistics for ARM MTE tag
> compression. This patch introduces allocation/deallocation counters
> for buffers that were stored uncompressed (and thus occupy 128 bytes of
> heap plus the Xarray overhead to store a pointer) and those that were
> compressed into 8-byte pointers (effectively using 0 bytes of heap in
> addition to the Xarray overhead).
> 
> The counters are exposed to the userspace via
> /sys/kernel/debug/mteswap/stats:
> 
>   # cat /sys/kernel/debug/mteswap/stats
>   8 bytes:      102496 allocations,     67302 deallocations
>   128 bytes:    212234 allocations,     178278 deallocations
>   uncompressed tag storage size:        8851200
>   compressed tag storage size:  4346368
> 
> Suggested-by: Yury Norov <yury.norov@...il.com>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>

Reviewed-by: Yury Norov <yury.norov@...il.com>