Message-ID:
 <VI2PR04MB111475781D58AE4EA89988D9DE8A12@VI2PR04MB11147.eurprd04.prod.outlook.com>
Date: Thu, 27 Mar 2025 08:25:04 +0000
From: Carlos Song <carlos.song@....com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
CC: "surenb@...gle.com" <surenb@...gle.com>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>, "willy@...radead.org" <willy@...radead.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-fsdevel@...r.kernel.org"
	<linux-fsdevel@...r.kernel.org>
Subject: RE: [EXT] Re: Ask help about this patch b951aaff5035 " mm: enable
 page allocation tagging"



> -----Original Message-----
> From: Kent Overstreet <kent.overstreet@...ux.dev>
> Sent: Thursday, March 20, 2025 7:25 PM
> To: Carlos Song <carlos.song@....com>
> Cc: surenb@...gle.com; akpm@...ux-foundation.org; willy@...radead.org;
> linux-mm@...ck.org; linux-kernel@...r.kernel.org;
> linux-fsdevel@...r.kernel.org
> Subject: [EXT] Re: Ask help about this patch b951aaff5035 " mm: enable page
> allocation tagging"
>
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report this
> email' button
>
>
> On Thu, Mar 20, 2025 at 11:07:41AM +0000, Carlos Song wrote:
> > Hi, all
> >
> > I found a 300ms~600ms IRQ off when writing 1Gb data to mmc device at
> I.MX7d SDB board at Linux-kernel-v6.14.
> > But I test the same case at Linux-kernel-v6.7, this longest IRQ off time is only
> 1ms~2ms. So the issue is introduced from v6.7~v6.14.
> >
> > Run this cmd to test:
> > dd if=/dev/zero of=/dev/mmcblk2p4 bs=4096 seek=12500 count=256000
> > conv=fsync
> >
> > This issue looks from blkdev_buffered_write() function. Because when I
> > run this cmd with "oflag=direct" to use blkdev_direct_write(), I can not see
> any long time IRQ off.
> >
> > Then I use Ftrace irqoff tracer to trace the longest IRQ off event, I found some
> differences between v6.7 and v6.14:
> > In iomap_file_buffered_write(), __folio_alloc (in v6.7) is replaced by
> _folio_alloc_noprof (in v6.14) by this patch.
> > The spinlock disabled IRQ ~300ms+. It looks there are some fixes for this patch,
> but I still can see IRQ off 300ms+ at 6.14.0-rc7-next-20250319.
> >
> > Do I trigger one bug? I know little about mem so I have to report it and hope I
> can get some help or guide.
> > I put my ftrace log at the mail tail to help trace and explain.
>
> Did you track down which spinlock?
>
> >

Hi,

Sorry for my late reply and thank you for your quick reply!
>From the trace log, I think the spinlock is from here like this:

__alloc_frozen_pages_noprof ==> get_page_from_freelist==>spinclok

Do you need other log not only this?

> > => get_page_from_freelist"
> > => __alloc_frozen_pages_noprof
> > => __folio_alloc_noprof
> > => __filemap_get_folio


> > commit b951aaff503502a7fe066eeed2744ba8a6413c89
> > Author: Suren Baghdasaryan
> surenb@...gle.com<mailto:surenb@...gle.com>
> > Date:   Thu Mar 21 09:36:40 2024 -0700
> >
> >     mm: enable page allocation tagging
> >
> >     Redefine page allocators to record allocation tags upon their invocation.
> >     Instrument post_alloc_hook and free_pages_prepare to modify current
> >     allocation tag.
> >
> >     [surenb@...gle.com: undo _noprof additions in the documentation]
> >       Link:
> https://lkml.kern/
> el.org%2Fr%2F20240326231453.1206227-3-surenb%40google.com&data=05%
> 7C02%7Ccarlos.song%40nxp.com%7Cdf027bbb97074fc2cde808dd67a1d6c5%7
> C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638780666983046738%
> 7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDA
> wMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C
> &sdata=Aby13KyQjF5pcbYW%2BkfsEJLiaPmS2ZiJLUHJ%2BCr2JXM%3D&reserve
> d=0
> >     Link:
> https://lkml.kern/
> el.org%2Fr%2F20240321163705.3067592-19-surenb%40google.com&data=05
> %7C02%7Ccarlos.song%40nxp.com%7Cdf027bbb97074fc2cde808dd67a1d6c5%
> 7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638780666983065790
> %7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMD
> AwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7
> C&sdata=n0hjs2fhjYs%2BcnbrxHy4vFK6D4GFVL4%2Fu72anOOLiEI%3D&reserve
> d=0
> >     Signed-off-by: Suren Baghdasaryan
> surenb@...gle.com<mailto:surenb@...gle.com>
> >     Co-developed-by: Kent Overstreet
> kent.overstreet@...ux.dev<mailto:kent.overstreet@...ux.dev>
> >     Signed-off-by: Kent Overstreet
> kent.overstreet@...ux.dev<mailto:kent.overstreet@...ux.dev>
> >     Reviewed-by: Kees Cook
> keescook@...omium.org<mailto:keescook@...omium.org>
> >     Tested-by: Kees Cook
> keescook@...omium.org<mailto:keescook@...omium.org>
> >     Cc: Alexander Viro
> viro@...iv.linux.org.uk<mailto:viro@...iv.linux.org.uk>
> >     Cc: Alex Gaynor
> alex.gaynor@...il.com<mailto:alex.gaynor@...il.com>
> >     Cc: Alice Ryhl aliceryhl@...gle.com<mailto:aliceryhl@...gle.com>
> >     Cc: Andreas Hindborg
> a.hindborg@...sung.com<mailto:a.hindborg@...sung.com>
> >     Cc: Benno Lossin
> benno.lossin@...ton.me<mailto:benno.lossin@...ton.me>
> >     Cc: "Björn Roy Baron"
> bjorn3_gh@...tonmail.com<mailto:bjorn3_gh@...tonmail.com>
> >     Cc: Boqun Feng
> boqun.feng@...il.com<mailto:boqun.feng@...il.com>
> >     Cc: Christoph Lameter cl@...ux.com<mailto:cl@...ux.com>
> >     Cc: Dennis Zhou dennis@...nel.org<mailto:dennis@...nel.org>
> >     Cc: Gary Guo gary@...yguo.net<mailto:gary@...yguo.net>
> >     Cc: Miguel Ojeda ojeda@...nel.org<mailto:ojeda@...nel.org>
> >     Cc: Pasha Tatashin
> pasha.tatashin@...een.com<mailto:pasha.tatashin@...een.com>
> >     Cc: Peter Zijlstra peterz@...radead.org<mailto:peterz@...radead.org>
> >     Cc: Tejun Heo tj@...nel.org<mailto:tj@...nel.org>
> >     Cc: Vlastimil Babka vbabka@...e.cz<mailto:vbabka@...e.cz>
> >     Cc: Wedson Almeida Filho
> wedsonaf@...il.com<mailto:wedsonaf@...il.com>
> >     Signed-off-by: Andrew Morton
> > akpm@...ux-foundation.org<mailto:akpm@...ux-foundation.org>
> >
> >
> > Ftrace irqoff tracer shows detail:
> > At v6.14:
> > # tracer: irqsoff
> > #
> > # irqsoff latency trace v1.1.5 on 6.14.0-rc7-next-20250319 #
> > --------------------------------------------------------------------
> > # latency: 279663 us, #21352/21352, CPU#0 | (M:NONE VP:0, KP:0, SP:0 HP:0
> #P:2)
> > #    -----------------
> > #    | task: dd-805 (uid:0 nice:0 policy:0 rt_prio:0)
> > #    -----------------
> > #  => started at: __rmqueue_pcplist
> > #  => ended at:   _raw_spin_unlock_irqrestore
> > #
> > #
> > #                    _------=> CPU#
> > #                   / _-----=> irqs-off/BH-disabled
> > #                  | / _----=> need-resched
> > #                  || / _---=> hardirq/softirq
> > #                  ||| / _--=> preempt-depth
> > #                  |||| / _-=> migrate-disable
> > #                  ||||| /     delay
> > #  cmd     pid     |||||| time  |   caller
> > #     \   /        ||||||  \    |    /
> >       dd-805       0d....    1us : __rmqueue_pcplist
> >       dd-805       0d....    3us : _raw_spin_trylock
> <-__rmqueue_pcplist
> >       dd-805       0d....    7us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d....   10us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d....   12us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d....   15us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d....   17us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d....   19us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >    ...
> >       dd-805       0d.... 1535us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1538us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1539us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1542us+: try_to_claim_block
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1597us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1599us+: try_to_claim_block
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1674us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1676us+: try_to_claim_block
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1716us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1718us+: try_to_claim_block
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1801us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 1803us+: try_to_claim_block
> <-__rmqueue_pcplist
> > ...
> >      dd-805       0d.... 279555us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279556us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279558us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279560us+: try_to_claim_block
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279616us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279618us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279620us : find_suitable_fallback
> <-__rmqueue_pcplist
> > ...
> >       dd-805       0d.... 279658us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279660us : _raw_spin_unlock_irqrestore
> <-__rmqueue_pcplist
> >       dd-805       0d.... 279662us : _raw_spin_unlock_irqrestore
> >       dd-805       0d.... 279666us+: trace_hardirqs_on
> <-_raw_spin_unlock_irqrestore
> >       dd-805       0d.... 279712us : <stack trace>
> > => get_page_from_freelist
> > => __alloc_frozen_pages_noprof
> > => __folio_alloc_noprof
> > => __filemap_get_folio
> > => iomap_write_begin
> > => iomap_file_buffered_write
> > => blkdev_write_iter
> > => vfs_write
> > => ksys_write
> > => ret_fast_syscall
> >
> > At v6.7:
> > # tracer: irqsoff
> > #
> > # irqsoff latency trace v1.1.5 on 6.7.0 #
> > --------------------------------------------------------------------
> > # latency: 2477 us, #146/146, CPU#0 | (M:server VP:0, KP:0, SP:0 HP:0 #P:2)
> > #    -----------------
> > #    | task: dd-808 (uid:0 nice:0 policy:0 rt_prio:0)
> > #    -----------------
> > #  => started at: _raw_spin_lock_irqsave
> > #  => ended at:   _raw_spin_unlock_irqrestore
> > #
> > #
> > #                    _------=> CPU#
> > #                   / _-----=> irqs-off/BH-disabled
> > #                  | / _----=> need-resched
> > #                  || / _---=> hardirq/softirq
> > #                  ||| / _--=> preempt-depth
> > #                  |||| / _-=> migrate-disable
> > #                  ||||| /     delay
> > #  cmd     pid     |||||| time  |   caller
> > #     \   /        ||||||  \    |    /
> >       dd-808       0d....    1us!: _raw_spin_lock_irqsave
> >       dd-808       0d....  186us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  189us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  191us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  192us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  194us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  196us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  199us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  203us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d....  330us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  332us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  334us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  336us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  338us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  339us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  341us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  343us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d....  479us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  481us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  483us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  485us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  486us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  488us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  490us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  492us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d....  630us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  632us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  634us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  636us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  638us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  640us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  642us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  644us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d....  771us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  773us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  775us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  777us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  778us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  780us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  782us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  784us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d....  911us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  913us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  915us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  916us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  918us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  920us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  922us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d....  924us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1055us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1058us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1059us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1061us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1063us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1065us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1066us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1068us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1194us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1196us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1198us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1200us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1202us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1203us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1205us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1208us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1333us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1335us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1337us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1339us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1341us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1342us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1344us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1346us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1480us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1482us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1484us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1486us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1488us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1490us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1492us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1494us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1621us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1623us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1625us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1627us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1629us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1630us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1632us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1634us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1761us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1763us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1765us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1766us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1768us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1770us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1772us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1774us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 1900us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1902us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1903us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1905us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1907us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1909us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1911us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 1913us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 2038us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2040us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2042us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2044us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2046us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2047us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2049us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2051us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2053us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2055us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 2175us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2176us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2178us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2180us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2182us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2183us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2185us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2187us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2189us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2191us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2192us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2194us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2196us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 2323us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2325us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2327us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2328us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2330us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2332us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2334us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2335us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2337us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2339us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2341us : find_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2343us : steal_suitable_fallback
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2345us!: move_freepages_block
> <-steal_suitable_fallback
> >       dd-808       0d.... 2470us : __mod_zone_page_state
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2473us : _raw_spin_unlock_irqrestore
> <-__rmqueue_pcplist
> >       dd-808       0d.... 2476us : _raw_spin_unlock_irqrestore
> >       dd-808       0d.... 2479us+: tracer_hardirqs_on
> <-_raw_spin_unlock_irqrestore
> >       dd-808       0d.... 2520us : <stack trace>
> > => get_page_from_freelist
> > => __alloc_pages
> > => __folio_alloc
> > => __filemap_get_folio
> > => iomap_write_begin
> > => iomap_file_buffered_write
> > => blkdev_write_iter
> > => vfs_write
> > => ksys_write
> > => ret_fast_syscall
> >
> > Best Regard
> > Carlos Song
> >

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