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Re: Define MADV_COLD and MADV_PAGEOUT from Linux 5.4
- From: Florian Weimer <fw at deneb dot enyo dot de>
- To: Joseph Myers <joseph at codesourcery dot com>
- Cc: <libc-alpha at sourceware dot org>
- Date: Thu, 28 Nov 2019 07:50:45 +0100
- Subject: Re: Define MADV_COLD and MADV_PAGEOUT from Linux 5.4
- References: <alpine.DEB.2.21.1911272345240.14409@digraph.polyomino.org.uk>
* Joseph Myers:
> Linux 5.4 adds constants MADV_COLD and MADV_PAGEOUT (defined with the
> same values on all architectures). This patch adds them to
> bits/mman-linux.h.
>
> Tested for x86_64.
>
> diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h
> b/sysdeps/unix/sysv/linux/bits/mman-linux.h
> index d6755c59d5..c0b11bfe24 100644
> --- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
> +++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
> @@ -87,6 +87,8 @@
> # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */
> # define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */
> # define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */
> +# define MADV_COLD 20 /* Deactivate these pages. */
> +# define MADV_PAGEOUT 21 /* Reclaim these pages. */
> # define MADV_HWPOISON 100 /* Poison a page for testing. */
> #endif
I've verified that this matches what's in the UAPI headers. Looks good.