linux-kernel - Re: [PATCH] mm/mempolicy: count MPOL_WEIGHTED_INTERLEAVE to "interleave

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Message-ID: <20241231030815.689-1-honggyu.kim@sk.com>
Date: Tue, 31 Dec 2024 12:08:10 +0900
From: Honggyu Kim <honggyu.kim@...com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: kernel_team@...ynix.com,
	42.hyeyoo@...il.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hyeonggon Yoo <hyeonggon.yoo@...com>,
	Yunjeong Mun <yunjeong.mun@...com>,
	Gregory Price <gourry@...rry.net>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] mm/mempolicy: count MPOL_WEIGHTED_INTERLEAVE to "interleave_hit"

On Mon, 30 Dec 2024 10:22:24 +0900 Hyeonggon Yoo <hyeonggon.yoo@...com> wrote:
> 
> 
> On 2024-12-27 6:57 AM, Honggyu Kim wrote:
> > The fa3bea4e1f82 introduced MPOL_WEIGHTED_INTERLEAVE but it missed
> > adding its counter to "interleave_hit" of numastat, which is located at
> > /sys/devices/system/node/nodeN/ directory.
> > 
> > It'd be better to add weighted interleving counter info to the existing
> > "interleave_hit" instead of introducing a new counter
> > "weighted_interleave_hit".
> > 
> > Fixes: fa3bea4e1f82 ("mm/mempolicy: introduce MPOL_WEIGHTED_INTERLEAVE for weighted interleaving")
> > Cc: Gregory Price <gourry@...rry.net>
> > Cc: Andi Kleen <ak@...ux.intel.com>
> > Signed-off-by: Honggyu Kim <honggyu.kim@...com>
> > ---
> >   mm/mempolicy.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> > index 04f35659717a..162407fbf2bc 100644
> > --- a/mm/mempolicy.c
> > +++ b/mm/mempolicy.c
> > @@ -2268,7 +2268,8 @@ struct page *alloc_pages_mpol_noprof(gfp_t gfp, unsigned int order,
> >   
> >   	page = __alloc_pages_noprof(gfp, order, nid, nodemask);
> >   
> > -	if (unlikely(pol->mode == MPOL_INTERLEAVE) && page) {
> > +	if (unlikely(pol->mode == MPOL_INTERLEAVE ||
> > +		     pol->mode == MPOL_WEIGHTED_INTERLEAVE) && page) {
> >   		/* skip NUMA_INTERLEAVE_HIT update if numa stats is disabled */
> >   		if (static_branch_likely(&vm_numa_stat_key) &&
> >   		    page_to_nid(page) == nid) {
> > 
> > base-commit: 4bbf9020becbfd8fc2c3da790855b7042fad455b
> 
> [+Cc Andrew]
> 
> Looks good to me,
> Reviewed-by: Hyeonggon Yoo <hyeonggon.yoo@...com>
> 
> We discovered that interleave_hit is not correctly accounted
> while testing MPOL_WEIGHTED_INTERLEAVE on libnuma and this patch
> fixes the issue.
> 
> Tested-by: Yunjeong Mun <yunjeong.mun@...com>
> 
> For reference:
> https://github.com/numactl/numactl/pull/238#issuecomment-2563532910

Hi Andrew,

I saw this patch has been merged into mm-unstable only with Gregory's
Reviewed-by tag.
https://lore.kernel.org/mm-commits/20241231002913.D5122C4CED0@smtp.kernel.org

But this patch is contributed by Hyeonggon and Yunjeong together for
their review and testing so please add their tags above in the commit
message together.

Thanks,
Honggyu

> --
> Hyeonggon
>