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From: Mel Gorman <mgorman@suse.de>
To: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Yang Shi <shy828301@gmail.com>,
	kirill.shutemov@linux.intel.com, ziy@nvidia.com, mhocko@suse.com,
	ying.huang@intel.com, hughd@google.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,
	Alexander Gordeev <agordeev@linux.ibm.com>
Subject: Re: [RFC PATCH 0/6] mm: thp: use generic THP migration for NUMA hinting fault
Date: Wed, 31 Mar 2021 14:20:53 +0100	[thread overview]
Message-ID: <20210331132053.GW15768@suse.de> (raw)
In-Reply-To: <20210330164200.01a4b78f@thinkpad>

On Tue, Mar 30, 2021 at 04:42:00PM +0200, Gerald Schaefer wrote:
> Could there be a work-around by splitting THP pages instead of marking them
> as migrate pmds (via pte swap entries), at least when THP migration is not
> supported? I guess it could also be acceptable if THP pages were simply not
> migrated for NUMA balancing on s390, but then we might need some extra config
> option to make that behavior explicit.
> 

The split is not done on other architectures simply because the loss
from splitting exceeded the gain of improved locality in too many cases.
However, it might be ok as an s390-specific workaround.

(Note, I haven't read the rest of the series due to lack of time but this
query caught my eye).

-- 
Mel Gorman
SUSE Labs

  parent reply	other threads:[~2021-03-31 13:21 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29 18:33 [RFC PATCH 0/6] mm: thp: use generic THP migration for NUMA hinting fault Yang Shi
2021-03-29 18:33 ` [PATCH 1/6] mm: memory: add orig_pmd to struct vm_fault Yang Shi
2021-03-29 18:33 ` [PATCH 2/6] mm: memory: make numa_migrate_prep() non-static Yang Shi
2021-03-29 18:33 ` [PATCH 3/6] mm: migrate: teach migrate_misplaced_page() about THP Yang Shi
2021-03-30  0:21   ` Huang, Ying
2021-03-30  0:21     ` Huang, Ying
2021-03-30 16:57     ` Yang Shi
2021-03-30 16:57       ` Yang Shi
2021-03-29 18:33 ` [PATCH 4/6] mm: thp: refactor NUMA fault handling Yang Shi
2021-03-30  0:41   ` Huang, Ying
2021-03-30  0:41     ` Huang, Ying
2021-03-30 17:02     ` Yang Shi
2021-03-30 17:02       ` Yang Shi
2021-04-01  2:34   ` kernel test robot
2021-03-29 18:33 ` [PATCH 5/6] mm: migrate: don't split THP for misplaced NUMA page Yang Shi
2021-03-30 14:42   ` Gerald Schaefer
2021-03-30 16:53     ` Yang Shi
2021-03-30 16:53       ` Yang Shi
2021-03-29 18:33 ` [PATCH 6/6] mm: migrate: remove redundant page count check for THP Yang Shi
2021-03-30 14:42 ` [RFC PATCH 0/6] mm: thp: use generic THP migration for NUMA hinting fault Gerald Schaefer
2021-03-30 16:51   ` Yang Shi
2021-03-30 16:51     ` Yang Shi
2021-03-31 11:47     ` Gerald Schaefer
2021-04-01 20:10       ` Yang Shi
2021-04-01 20:10         ` Yang Shi
2021-04-06 12:02         ` Gerald Schaefer
2021-04-06 16:42           ` Yang Shi
2021-04-06 16:42             ` Yang Shi
2021-04-07  8:32             ` Mel Gorman
2021-04-07 16:04               ` Yang Shi
2021-04-07 16:04                 ` Yang Shi
2021-03-31 13:20   ` Mel Gorman [this message]
2021-04-01 20:12     ` Yang Shi
2021-04-01 20:12       ` Yang Shi

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