Re: [PATCH 00/18] mfd: convert to use maple tree register cache

[Mark Brown]

On Tue, Feb 06, 2024 at 11:14:11AM +0100, Geert Uytterhoeven wrote:
> On Tue, Feb 6, 2024 at 11:09 AM Mark Brown <broonie@xxxxxxxxxx> wrote:

> > There is a very small niche for devices where cache syncs are a
> > particularly important part of the workload where rbtree's choices might
> > give better performance, especially on systems with low end CPUs.

> The REGCACHE_* value is specified by the device, not by the CPU?

The device is going to dominate here, the main thing is how much of the
workload consists of syncs.

> While some of these MFD devices are on-SoC, and thus there is some
> relation between device and CPU, several others (e.g. PMICs) are
> external, and thus might be present on systems with a variety of CPU
> performance.

> Perhaps the value should depend on some CPU heuristic instead?

No.

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