Re: [RFC PATCH 03/30] Lazy percpu counters

[Mel Gorman]

On Tue, Aug 30, 2022 at 02:48:52PM -0700, Suren Baghdasaryan wrote:
> From: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> 
> This patch adds lib/lazy-percpu-counter.c, which implements counters
> that start out as atomics, but lazily switch to percpu mode if the
> update rate crosses some threshold (arbitrarily set at 256 per second).
> 
> Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>

Why not use percpu_counter? It has a per-cpu counter that is synchronised
when a batch threshold (default 32) is exceeded and can explicitly sync
the counters when required assuming the synchronised count is only needed
when reading debugfs.

-- 
Mel Gorman
SUSE Labs