From: Ying Huang <ying.huang@intel.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Davidlohr Bueso <dave@stgolabs.net>,
linux-mm@kvack.org, Wei Xu <weixugc@google.com>
Cc: mhocko@kernel.org, akpm@linux-foundation.org,
rientjes@google.com, yosryahmed@google.com, hannes@cmpxchg.org,
shakeelb@google.com, dave.hansen@linux.intel.com,
tim.c.chen@linux.intel.com, roman.gushchin@linux.dev,
gthelen@google.com, a.manzanares@samsung.com,
heekwon.p@samsung.com, gim.jongmin@samsung.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/6] mm/vmscan: use node_is_toptier helper in node_reclaim
Date: Wed, 01 Jun 2022 14:12:22 +0800 [thread overview]
Message-ID: <61c47f98b4c0be1d5da5e097779412f9edd70753.camel@intel.com> (raw)
In-Reply-To: <87h755dip9.fsf@linux.ibm.com>
On Tue, 2022-05-31 at 17:20 +0530, Aneesh Kumar K.V wrote:
> Davidlohr Bueso <dave@stgolabs.net> writes:
>
> > We have helpers for a reason.
> >
> > Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
> > ---
> > mm/vmscan.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index 1678802e03e7..cb583fcbf5bf 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -4750,7 +4750,7 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
> > * over remote processors and spread off node memory allocations
> > * as wide as possible.
> > */
> > - if (node_state(pgdat->node_id, N_CPU) && pgdat->node_id != numa_node_id())
> > + if (node_is_toptier(pgdat->node_id) && pgdat->node_id != numa_node_id())
> > return NODE_RECLAIM_NOSCAN;
> >
> >
> > if (test_and_set_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags))
>
>
> Are we really looking at the top tier in a tiered memory hierarchy here?
> The comment seems to suggest we are looking at local NUMA node?
The code change itself is correct. But it is an implementation details
that node_is_toptier() == node_state(, N_CPU). And after we supporting
more memory tiers (like GPU, HBM), we will change the implementation of
node_is_toptier() soon. So I think that it's better to keep the
original code.
Best Regards,
Huang, Ying
next prev parent reply other threads:[~2022-06-01 6:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-16 5:38 [PATCH RFC lsfmm 0/6] mm: proactive reclaim and memory tiering topics Davidlohr Bueso
2022-04-16 5:38 ` [PATCH 1/6] drivers/base/node: cleanup register_node() Davidlohr Bueso
2022-04-25 22:30 ` Adam Manzanares
2022-05-03 18:17 ` David Hildenbrand
2022-05-04 4:33 ` David Rientjes
2022-04-16 5:38 ` [PATCH 2/6] mm/vmscan: use node_is_toptier helper in node_reclaim Davidlohr Bueso
2022-04-25 22:32 ` Adam Manzanares
2022-05-04 4:33 ` David Rientjes
2022-05-04 7:26 ` Jagdish Gediya
2022-05-31 11:50 ` Aneesh Kumar K.V
2022-06-01 6:12 ` Ying Huang [this message]
2022-06-01 14:00 ` Davidlohr Bueso
2022-04-16 5:38 ` [PATCH 3/6] mm: make __node_reclaim() more flexible Davidlohr Bueso
2022-04-16 5:39 ` [PATCH 4/6] mm: introduce per-node proactive reclaim interface Davidlohr Bueso
2022-04-19 0:00 ` Tim Chen
2022-04-16 5:39 ` [PATCH 5/6] mm/migration: export demotion_path of a node via sysfs Davidlohr Bueso
2022-04-22 17:31 ` Yang Shi
2022-04-22 17:33 ` Yang Shi
2022-04-22 17:50 ` Davidlohr Bueso
2022-04-17 3:49 ` [PATCH 6/6] mm/migrate: export whether or not node is toptier in sysf Davidlohr Bueso
2022-04-18 15:34 ` Dave Hansen
2022-04-18 16:45 ` Davidlohr Bueso
2022-04-18 16:50 ` Dave Hansen
2022-04-18 17:01 ` Davidlohr Bueso
2022-04-22 17:37 ` Yang Shi
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