Re: [PATCH v3] mm/page_alloc: only update lowmem_reserve_ratio on sysctl write

Jianlin Shi <[email protected]> Sun, 2 Aug 2026 22:31:54 +0800

Newsgroups	gmane.linux.kernel,gmane.linux.kernel.mm
Message-ID	<[email protected]>

On Sat, 1 Aug 2026 11:44:34 -0700 Andrew Morton wrote:
> Not sure what to do here.  Perhaps pass proc_dointvec_minmax() a
> temporary then copy that into sysctl_lowmem_reserve_ratio if all
> proc_dointvec_minmax() returns "OK".

Hi Andrew,

Thanks for the suggestion.  v4 uses a temporary ratio[] on write and
only copies into sysctl_lowmem_reserve_ratio[] and calls
setup_per_zone_lowmem_reserve() after the full parse succeeds.

I'll send [PATCH v4] in a separate mail shortly.

Thanks,
Jianlin