From: Michal Hocko <mhocko@suse.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>,
linux-mm@kvack.org, akpm@linux-foundation.org,
Ben Widawsky <ben.widawsky@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Feng Tang <feng.tang@intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Mel Gorman <mgorman@techsingularity.net>,
Mike Kravetz <mike.kravetz@oracle.com>,
Randy Dunlap <rdunlap@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
Dan Williams <dan.j.williams@intel.com>,
Huang Ying <ying.huang@intel.com>
Subject: Re: [RFC PATCH] mm/mempolicy: add MPOL_PREFERRED_STRICT memory policy
Date: Wed, 13 Oct 2021 16:21:30 +0200 [thread overview]
Message-ID: <YWbratv0//ySA7vD@dhcp22.suse.cz> (raw)
In-Reply-To: <f9619358-e570-fa29-2599-ac0480ce0df3@linux.ibm.com>
On Wed 13-10-21 18:53:55, Aneesh Kumar K.V wrote:
> On 10/13/21 18:46, Andi Kleen wrote:
> >
> > > The difference with MPOL_BIND is the ability to specify a preferred node
> > > which is the first node in the nodemask argument passed.
> >
> > That's always the one with the lowest number. Isn't that quite limiting
> > in practice?
> >
> > It seems if you really want to do that you would need another argument.
> >
> Yes. But that would make it a new syscall. Should we do that?
Yes, I do not see any reasonable to cram this into the existing syscall.
I am not yet sure what the syscall should look like though. I can see
two usecases, one of the is a very specific node allocation fallback
order requirement and another one is preferrence for a cpu less node
over other nodes. Both are slightly different.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-10-13 14:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 9:45 Aneesh Kumar K.V
2021-10-13 10:42 ` Michal Hocko
2021-10-13 10:48 ` Michal Hocko
2021-10-13 12:35 ` Aneesh Kumar K.V
2021-10-13 12:50 ` Michal Hocko
2021-10-13 12:58 ` Aneesh Kumar K.V
2021-10-13 13:07 ` Michal Hocko
2021-10-13 13:10 ` Aneesh Kumar K.V
2021-10-13 14:22 ` Michal Hocko
2021-10-13 13:57 ` Aneesh Kumar K.V
2021-10-13 14:26 ` Michal Hocko
2021-10-13 13:16 ` Andi Kleen
2021-10-13 13:23 ` Aneesh Kumar K.V
2021-10-13 14:21 ` Michal Hocko [this message]
2021-10-14 9:30 ` Aneesh Kumar K.V
2021-10-14 9:38 ` Michal Hocko
2021-10-14 10:28 ` Aneesh Kumar K.V
2021-10-14 11:41 ` Michal Hocko
2021-10-14 13:29 ` Aneesh Kumar K.V
2021-10-14 14:56 ` Michal Hocko
2021-10-14 15:50 ` Aneesh Kumar K.V
2021-10-19 9:38 ` Michal Hocko
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