From: Alexander Gordeev <agordeev@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Nico Pache <npache@redhat.com>,
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Subject: Re: [PATCH mm-hotfixes-unstable v18 00/14] khugepaged: add mTHP collapse support
Date: Mon, 1 Jun 2026 17:58:08 +0200 [thread overview]
Message-ID: <20260601155808.2755103A59-agordeev@linux.ibm.com> (raw)
In-Reply-To: <20260522134724.f4f11941a85ef18b307d16ae@linux-foundation.org>
On Fri, May 22, 2026 at 01:47:24PM -0700, Andrew Morton wrote:
Hi Andrew et al,
> On Fri, 22 May 2026 08:59:55 -0600 Nico Pache <npache@redhat.com> wrote:
>
> > The following series provides khugepaged with the capability to collapse
> > anonymous memory regions to mTHPs.
>
> Thanks, I've update mm.git's mm-unstable branch to this version.
>
> It sounds like I might be dropping it soon, haven't started looking at
> that yet. But let's at least eyeball the latest version at this time.
>
> Sashiko was able to apply this, so the base-it-on-hotfixes thing worked
> well, thanks. The AI checking made a few allegations:
This series appears to cause hangs on s390 in linux-next.
The issue is not easily reproducible, so it is not yet confirmed.
Any ideas for a reliable reproducer that exercises the code path below?
[ 2749.385719] sysrq: Show Blocked State
[ 2749.385730] task:khugepaged state:D stack:0 pid:209 tgid:209 ppid:2 task_flags:0x200040 flags:0x00000000
[ 2749.385735] Call Trace:
[ 2749.385736] [<0000017f63c8b226>] __schedule+0x316/0x890
[ 2749.385740] [<0000017f63c8b7dc>] schedule+0x3c/0xc0
[ 2749.385743] [<0000017f63c8b888>] schedule_preempt_disabled+0x28/0x40
[ 2749.385746] [<0000017f63c902ea>] rwsem_down_write_slowpath+0x2fa/0x8b0
[ 2749.385749] [<0000017f63c90910>] down_write+0x70/0x80
[ 2749.385752] [<0000017f6313407a>] collapse_huge_page+0x2ea/0x9e0
[ 2749.385755] [<0000017f6313491e>] mthp_collapse+0x1ae/0x1f0
[ 2749.385757] [<0000017f63134fda>] collapse_scan_pmd+0x67a/0x8f0
[ 2749.385760] [<0000017f6313751a>] collapse_single_pmd+0x15a/0x260
[ 2749.385762] [<0000017f6313792c>] collapse_scan_mm_slot.constprop.0+0x30c/0x470
[ 2749.385765] [<0000017f63137cb6>] khugepaged+0x226/0x240
[ 2749.385768] [<0000017f62db3128>] kthread+0x148/0x170
[ 2749.385770] [<0000017f62d2c238>] __ret_from_fork+0x48/0x220
[ 2749.385772] [<0000017f63c95d0a>] ret_from_fork+0xa/0x30
Thanks!
next prev parent reply other threads:[~2026-06-01 15:58 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 14:59 [PATCH mm-hotfixes-unstable v18 00/14] khugepaged: add mTHP collapse support Nico Pache
2026-05-22 14:59 ` [PATCH mm-unstable v18 01/14] mm/khugepaged: generalize hugepage_vma_revalidate for mTHP support Nico Pache
2026-05-22 14:59 ` [PATCH mm-unstable v18 02/14] mm/khugepaged: generalize alloc_charge_folio() Nico Pache
2026-05-22 14:59 ` [PATCH mm-unstable v18 03/14] mm/khugepaged: rework max_ptes_* handling with helper functions Nico Pache
2026-05-22 21:16 ` David Hildenbrand (Arm)
2026-06-01 13:26 ` Lorenzo Stoakes
2026-05-22 14:59 ` [PATCH mm-unstable v18 04/14] mm/khugepaged: generalize __collapse_huge_page_* for mTHP support Nico Pache
2026-05-22 21:24 ` David Hildenbrand (Arm)
2026-05-26 14:39 ` Nico Pache
2026-06-01 14:04 ` Lorenzo Stoakes
2026-05-22 15:00 ` [PATCH mm-unstable v18 05/14] mm/khugepaged: require collapse_huge_page to enter/exit with the lock dropped Nico Pache
2026-06-01 14:07 ` Lorenzo Stoakes
2026-05-22 15:00 ` [PATCH mm-unstable v18 06/14] mm/khugepaged: generalize collapse_huge_page for mTHP collapse Nico Pache
2026-05-22 21:47 ` David Hildenbrand (Arm)
2026-05-26 14:42 ` Nico Pache
2026-05-31 9:39 ` Lance Yang
2026-05-31 20:00 ` David Hildenbrand (Arm)
2026-06-01 3:28 ` Lance Yang
2026-06-01 6:54 ` David Hildenbrand (Arm)
2026-06-01 7:49 ` Lance Yang
2026-06-01 8:15 ` David Hildenbrand (Arm)
2026-06-01 8:44 ` Lance Yang
2026-06-01 10:09 ` David Hildenbrand (Arm)
2026-06-01 9:08 ` Lance Yang
2026-06-01 10:23 ` David Hildenbrand (Arm)
2026-06-01 10:47 ` Lance Yang
2026-06-01 11:13 ` David Hildenbrand (Arm)
2026-06-01 15:00 ` Nico Pache
2026-06-01 15:05 ` David Hildenbrand (Arm)
2026-06-01 16:07 ` Lance Yang
2026-05-22 15:00 ` [PATCH mm-unstable v18 07/14] mm/khugepaged: skip collapsing mTHP to smaller orders Nico Pache
2026-05-22 21:51 ` David Hildenbrand (Arm)
2026-05-22 15:00 ` [PATCH mm-unstable v18 08/14] mm/khugepaged: add per-order mTHP collapse failure statistics Nico Pache
2026-05-31 20:09 ` David Hildenbrand (Arm)
2026-06-01 14:13 ` Lorenzo Stoakes
2026-05-22 15:00 ` [PATCH mm-unstable v18 09/14] mm/khugepaged: improve tracepoints for mTHP orders Nico Pache
2026-05-22 15:00 ` [PATCH mm-unstable v18 10/14] mm/khugepaged: introduce collapse_allowable_orders helper function Nico Pache
2026-05-31 20:18 ` David Hildenbrand (Arm)
2026-06-01 14:35 ` Lorenzo Stoakes
2026-06-01 14:40 ` David Hildenbrand (Arm)
2026-05-22 15:00 ` [PATCH mm-unstable v18 11/14] mm/khugepaged: Introduce mTHP collapse support Nico Pache
2026-05-25 14:15 ` Nico Pache
2026-05-25 19:10 ` Andrew Morton
2026-05-26 6:57 ` Wei Yang
2026-05-26 12:07 ` Nico Pache
2026-05-28 8:42 ` Wei Yang
2026-05-28 17:11 ` Nico Pache
2026-05-31 7:18 ` Lance Yang
2026-05-31 8:48 ` Lance Yang
2026-06-01 12:01 ` Nico Pache
2026-06-01 12:06 ` David Hildenbrand (Arm)
2026-06-01 8:11 ` David Hildenbrand (Arm)
2026-06-01 12:40 ` Nico Pache
2026-06-01 13:15 ` David Hildenbrand (Arm)
2026-05-22 15:00 ` [PATCH mm-unstable v18 12/14] mm/khugepaged: avoid unnecessary mTHP collapse attempts Nico Pache
2026-05-31 7:31 ` Lance Yang
2026-05-31 20:02 ` David Hildenbrand (Arm)
2026-06-01 1:53 ` Lance Yang
2026-05-22 15:00 ` [PATCH mm-unstable v18 13/14] mm/khugepaged: run khugepaged for all orders Nico Pache
2026-05-22 15:00 ` [PATCH mm-unstable v18 14/14] Documentation: mm: update the admin guide for mTHP collapse Nico Pache
2026-05-22 21:58 ` David Hildenbrand (Arm)
2026-05-26 12:00 ` Nico Pache
2026-05-26 14:45 ` Nico Pache
2026-05-22 15:07 ` [PATCH mm-hotfixes-unstable v18 00/14] khugepaged: add mTHP collapse support Nico Pache
2026-05-22 15:13 ` Vlastimil Babka (SUSE)
2026-05-22 16:11 ` Nico Pache
2026-05-22 21:13 ` David Hildenbrand (Arm)
2026-05-22 15:16 ` Lorenzo Stoakes
2026-05-22 16:08 ` Nico Pache
2026-05-22 16:19 ` Lorenzo Stoakes
2026-05-22 16:31 ` Nico Pache
2026-05-22 17:12 ` Lorenzo Stoakes
2026-05-26 8:14 ` Lorenzo Stoakes
2026-05-22 15:13 ` Lorenzo Stoakes
2026-05-22 20:47 ` Andrew Morton
2026-06-01 15:58 ` Alexander Gordeev [this message]
2026-06-01 17:05 ` Nico Pache
2026-06-01 17:08 ` Lorenzo Stoakes
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