linux-kernel - Re: [PATCH v5 09/11] mm/mempolicy: add get

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Message-ID: <CAMuHMdVN2-=Poa_tm5jr_tUE=iDh57hFF-bDpaf7hJiJi9Gtdw@mail.gmail.com>
Date: Tue, 2 Jan 2024 15:46:27 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Gregory Price <gourry.memverge@...il.com>
Cc: linux-mm@...ck.org, linux-doc@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-api@...r.kernel.org, x86@...nel.org, akpm@...ux-foundation.org, 
	arnd@...db.de, tglx@...utronix.de, luto@...nel.org, mingo@...hat.com, 
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, mhocko@...nel.org, 
	tj@...nel.org, ying.huang@...el.com, gregory.price@...verge.com, 
	corbet@....net, rakie.kim@...com, hyeongtak.ji@...com, honggyu.kim@...com, 
	vtavarespetr@...ron.com, peterz@...radead.org, jgroves@...ron.com, 
	ravis.opensrc@...ron.com, sthanneeru@...ron.com, emirakhur@...ron.com, 
	Hasan.Maruf@....com, seungjun.ha@...sung.com, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v5 09/11] mm/mempolicy: add get_mempolicy2 syscall

On Sat, Dec 23, 2023 at 7:14 PM Gregory Price <gourry.memverge@...il.com> wrote:
> get_mempolicy2 is an extensible get_mempolicy interface which allows
> a user to retrieve the memory policy for a task or address.
>
> Defined as:
>
> get_mempolicy2(struct mpol_args *args, size_t size,
>                unsigned long addr, unsigned long flags)
>
> Top level input values:
>
> mpol_args:    The field which collects information about the mempolicy
>               returned to userspace.
> addr:         if MPOL_F_ADDR is passed in `flags`, this address will be
>               used to return the mempolicy details of the vma the
>               address belongs to
> flags:        if MPOL_F_ADDR, return mempolicy info vma containing addr
>               else, returns task mempolicy information
>
> Input values include the following fields of mpol_args:
>
> pol_nodes:    if set, the nodemask of the policy returned here
> pol_maxnodes: if pol_nodes is set, must describe max number of nodes
>               to be copied to pol_nodes
>
> Output values include the following fields of mpol_args:
>
> mode:         mempolicy mode
> mode_flags:   mempolicy mode flags
> home_node:    policy home node will be returned here, or -1 if not.
> pol_nodes:    if set, the nodemask for the mempolicy
> policy_node:  if the policy has extended node information, it will
>               be placed here.  For example MPOL_INTERLEAVE will
>               return the next node which will be used for allocation
>
> MPOL_F_NODE has been dropped from get_mempolicy2 (EINVAL).
> MPOL_F_MEMS_ALLOWED has been dropped from get_mempolicy2 (EINVAL).
>
> Suggested-by: Michal Hocko <mhocko@...e.com>
> Signed-off-by: Gregory Price <gregory.price@...verge.com>

>  arch/m68k/kernel/syscalls/syscall.tbl         |  1 +

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds