From: Mel Gorman <mgorman@suse.de>
To: Yang Shi <shy828301@gmail.com>
Cc: kirill.shutemov@linux.intel.com, ziy@nvidia.com, mhocko@suse.com,
ying.huang@intel.com, hughd@google.com,
gerald.schaefer@linux.ibm.com, hca@linux.ibm.com,
gor@linux.ibm.com, borntraeger@de.ibm.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [v2 PATCH 7/7] mm: thp: skip make PMD PROT_NONE if THP migration is not supported
Date: Mon, 17 May 2021 16:30:44 +0100 [thread overview]
Message-ID: <20210517153044.GZ3672@suse.de> (raw)
In-Reply-To: <20210413212416.3273-8-shy828301@gmail.com>
On Tue, Apr 13, 2021 at 02:24:16PM -0700, Yang Shi wrote:
> A quick grep shows x86_64, PowerPC (book3s), ARM64 and S390 support both
> NUMA balancing and THP. But S390 doesn't support THP migration so NUMA
> balancing actually can't migrate any misplaced pages.
>
> Skip make PMD PROT_NONE for such case otherwise CPU cycles may be wasted
> by pointless NUMA hinting faults on S390.
>
> Signed-off-by: Yang Shi <shy828301@gmail.com>
Acked-by: Mel Gorman <mgorman@suse.de>
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2021-05-17 15:46 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 21:24 [v2 RFC PATCH 0/7] mm: thp: use generic THP migration for NUMA hinting fault Yang Shi
2021-04-13 21:24 ` [v2 PATCH 1/7] mm: memory: add orig_pmd to struct vm_fault Yang Shi
2021-05-17 15:09 ` Mel Gorman
2021-05-17 19:39 ` Yang Shi
2021-05-17 19:39 ` Yang Shi
2021-05-18 7:36 ` Mel Gorman
2021-05-18 17:03 ` Yang Shi
2021-05-18 17:03 ` Yang Shi
2021-04-13 21:24 ` [v2 PATCH 2/7] mm: memory: make numa_migrate_prep() non-static Yang Shi
2021-05-17 15:11 ` Mel Gorman
2021-04-13 21:24 ` [v2 PATCH 3/7] mm: thp: refactor NUMA fault handling Yang Shi
2021-04-14 2:43 ` Huang, Ying
2021-04-14 2:43 ` Huang, Ying
2021-04-14 17:15 ` Yang Shi
2021-04-14 17:15 ` Yang Shi
2021-05-17 15:27 ` Mel Gorman
2021-05-17 19:41 ` Yang Shi
2021-05-17 19:41 ` Yang Shi
2021-04-13 21:24 ` [v2 PATCH 4/7] mm: migrate: account THP NUMA migration counters correctly Yang Shi
2021-05-17 15:28 ` Mel Gorman
2021-04-13 21:24 ` [v2 PATCH 5/7] mm: migrate: don't split THP for misplaced NUMA page Yang Shi
2021-05-17 15:29 ` Mel Gorman
2021-04-13 21:24 ` [v2 PATCH 6/7] mm: migrate: check mapcount for THP instead of ref count Yang Shi
2021-04-14 3:00 ` Huang, Ying
2021-04-14 3:00 ` Huang, Ying
2021-04-14 15:02 ` Zi Yan
2021-04-15 6:45 ` Huang, Ying
2021-04-15 6:45 ` Huang, Ying
2021-04-15 18:57 ` Zi Yan
2021-04-14 17:23 ` Yang Shi
2021-04-14 17:23 ` Yang Shi
2021-04-13 21:24 ` [v2 PATCH 7/7] mm: thp: skip make PMD PROT_NONE if THP migration is not supported Yang Shi
2021-05-17 15:30 ` Mel Gorman [this message]
2021-05-03 21:58 ` [v2 RFC PATCH 0/7] mm: thp: use generic THP migration for NUMA hinting fault Yang Shi
2021-05-03 21:58 ` Yang Shi
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