linux-kernel - Re: [RFC PATCH V1 00/13] mm: slowtier page promotion based on PTE A bit

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Message-ID: <20250321203555.4n6byk6vmnkmpewi@offworld>
Date: Fri, 21 Mar 2025 13:35:55 -0700
From: Davidlohr Bueso <dave@...olabs.net>
To: Raghavendra K T <raghavendra.kt@....com>
Cc: AneeshKumar.KizhakeVeetil@....com, Hasan.Maruf@....com,
	Michael.Day@....com, akpm@...ux-foundation.org, bharata@....com,
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	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
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Subject: Re: [RFC PATCH V1 00/13] mm: slowtier page promotion based on PTE A
 bit

On Fri, 21 Mar 2025, Raghavendra K T wrote:

>>But a longer running/ more memory workload may make more difference.
>>I will comeback with that number.
>
>                 base NUMAB=2   Patched NUMAB=0
>                 time in sec    time in sec
>===================================================
>8G:              134.33 (0.19)   119.88 ( 0.25)
>16G:             292.24 (0.60)   325.06 (11.11)
>32G:             585.06 (0.24)   546.15 ( 0.50)
>64G:            1278.98 (0.27)  1221.41 ( 1.54)
>
>We can see that numbers have not changed much between NUMAB=1 NUMAB=0 in
>patched case.

Thanks. Since this might vary across workloads, another important metric
here is numa hit/misses statistics.

fyi I have also been trying this series to get some numbers as well, but
noticed overnight things went south (so no chance before LSFMM):

[  464.026917] watchdog: BUG: soft lockup - CPU#108 stuck for 52s! [kmmscand:934]
[  464.026924] Modules linked in: ...
[  464.027098] CPU: 108 UID: 0 PID: 934 Comm: kmmscand Tainted: G             L     6.14.0-rc6-kmmscand+ #4
[  464.027105] Tainted: [L]=SOFTLOCKUP
[  464.027107] Hardware name: Supermicro SSG-121E-NE3X12R/X13DSF-A, BIOS 2.1 01/29/2024
[  464.027109] RIP: 0010:pmd_off+	0x58/0xd0
[  464.027124] Code: 83 e9 01 48 21 f1 48 c1 e1 03 48 89 f8 0f 1f 00 48 23 05 fb c7 fd 00 48 03 0d 0c b9 fb 00 48 25 00 f0 ff ff 48 01 c8 48 8b 38 <48> 89 f8 0f 1f 00 48 8b 0d db c7 fd 00 48 21 c1 48 89 d0 48 c1 e8
[  464.027128] RSP: 0018:ff71a0dc1b05bbc8 EFLAGS: 00000286
[  464.027133] RAX: ff3b028e421c17f0 RBX: ffc90cb8322e5e00 RCX: ff3b020d400007f0
[  464.027136] RDX: 00007f1393978000 RSI: 00000000000000fe RDI: 000000b9726b0067
[  464.027139] RBP: ff3b02f5d05babc0 R08: 00007f9c5653f000 R09: ffc90cb8322e0001
[  464.027141] R10: 0000000000000000 R11: ff3b028dd339420c R12: 00007f1393978000
[  464.027144] R13: ff3b028dded9cbb0 R14: ffc90cb8322e0000 R15: ffffffffb9a0a4c0
[  464.027146] FS:  0000000000000000(0000) GS:ff3b030bbf400000(0000) knlGS:0000000000000000
[  464.027150] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  464.027153] CR2: 0000564713088f19 CR3: 000000fb40822006 CR4: 0000000000773ef0
[  464.027157] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  464.027159] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[  464.027162] PKRU: 55555554
[  464.027163] Call Trace:
[  464.027166]  <IRQ>
[  464.027170]  ? watchdog_timer_fn+0x21b/0x2a0
[  464.027180]  ? __pfx_watchdog_timer_fn+0x10/0x10
[  464.027186]  ? __hrtimer_run_queues+0x10f/0x2a0
[  464.027193]  ? hrtimer_interrupt+0xfb/0x240
[  464.027199]  ? __sysvec_apic_timer_interrupt+0x4e/0x110
[  464.027208]  ? sysvec_apic_timer_interrupt+0x68/0x90
[  464.027219]  </IRQ>
[  464.027221]  <TASK>
[  464.027222]  ? asm_sysvec_apic_timer_interrupt+0x16/0x20
[  464.027236]  ? pmd_off+0x58/0xd0
[  464.027243]  hot_vma_idle_pte_entry+0x151/0x500
[  464.027253]  walk_pte_range_inner+0xbe/0x100
[  464.027260]  ? __pte_offset_map_lock+0x9a/0x110
[  464.027267]  walk_pgd_range+0x8f0/0xbb0
[  464.027271]  ? __pfx_hot_vma_idle_pte_entry+0x10/0x10
[  464.027282]  __walk_page_range+0x71/0x1d0
[  464.027287]  ? prepare_to_wait_event+0x53/0x180
[  464.027294]  walk_page_vma+0x98/0xf0
[  464.027300]  kmmscand+0x2aa/0x8d0
[  464.027310]  ? __pfx_kmmscand+0x10/0x10
[  464.027318]  kthread+0xea/0x230
[  464.027326]  ? finish_task_switch.isra.0+0x88/0x2d0
[  464.027335]  ? __pfx_kthread+0x10/0x10
[  464.027341]  ret_from_fork+0x2d/0x50
[  464.027350]  ? __pfx_kthread+0x10/0x10
[  464.027355]  ret_from_fork_asm+0x1a/0x30
[  464.027365]  </TASK>