Re: [PATCH 0/2 v6] add ioctl/sysfs to donate file-backed pages

Matthew Wilcox
2025-01-17T19:04:29Z

On Fri, Jan 17, 2025 at 06:48:55PM +0000, Jaegeuk Kim wrote:
> > I don't understand how this is different from MADV_COLD. Please
> > explain.
>
> MADV_COLD is a vma range, while this is a file range. So, it's more close to
> fadvise(POSIX_FADV_DONTNEED) which tries to reclaim the file-backed pages
> at the time when it's called. The idea is to keep the hints only, and try to
> reclaim all later when admin expects system memory pressure soon.

So you're saying you want POSIX_FADV_COLD?