Received-SPF: pass (google.com: domain of linux-kernel+bounces-14511-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Precedence: bulk
MIME-Version: 1.0
References: <20231223181101.1954-1-gregory.price@memverge.com> <20231223181101.1954-10-gregory.price@memverge.com>
In-Reply-To: <20231223181101.1954-10-gregory.price@memverge.com>
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 2 Jan 2024 15:46:27 +0100
Message-ID: <CAMuHMdVN2-=Poa_tm5jr_tUE=iDh57hFF-bDpaf7hJiJi9Gtdw@mail.gmail.com>
Subject: Re: [PATCH v5 09/11] mm/mempolicy: add get_mempolicy2 syscall
To: Gregory Price <gourry.memverge@gmail.com>
Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, 
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-api@vger.kernel.org, x86@kernel.org, akpm@linux-foundation.org, 
	arnd@arndb.de, tglx@linutronix.de, luto@kernel.org, mingo@redhat.com, 
	bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mhocko@kernel.org, 
	tj@kernel.org, ying.huang@intel.com, gregory.price@memverge.com, 
	corbet@lwn.net, rakie.kim@sk.com, hyeongtak.ji@sk.com, honggyu.kim@sk.com, 
	vtavarespetr@micron.com, peterz@infradead.org, jgroves@micron.com, 
	ravis.opensrc@micron.com, sthanneeru@micron.com, emirakhur@micron.com, 
	Hasan.Maruf@amd.com, seungjun.ha@samsung.com, Michal Hocko <mhocko@suse.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Sat, Dec 23, 2023 at 7:14=E2=80=AFPM Gregory Price <gourry.memverge@gmai=
l.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@suse.com>
> Signed-off-by: Gregory Price <gregory.price@memverge.com>

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

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

Gr{oetje,eeting}s,

                        Geert

--=20
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k=
.org

In personal conversations with technical people, I call myself a hacker. Bu=
t
when I'm talking to journalists I just say "programmer" or something like t=
hat.
                                -- Linus Torvalds