linux-kernel - Re: regression/bisected commit 773688a6cb24b0b3c2ba40354d883348a2befa38 make my system completely unusable under high load

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Message-ID: <CABXGCsM+9TxxY-bOUw6MyRV7CSZsyQpfDgvwgaBBKk9UONJkBw@mail.gmail.com>
Date: Fri, 19 Jan 2024 22:54:16 +0500
From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To: Marco Elver <elver@...gle.com>
Cc: glider@...gle.com, dvyukov@...gle.com, eugenis@...gle.com, 
	Oscar Salvador <osalvador@...e.de>, Vlastimil Babka <vbabka@...e.cz>, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, 
	Linux Memory Management List <linux-mm@...ck.org>, Andrey Konovalov <andreyknvl@...il.com>
Subject: Re: regression/bisected commit 773688a6cb24b0b3c2ba40354d883348a2befa38
 make my system completely unusable under high load

On Fri, Jan 19, 2024 at 4:00 PM Marco Elver <elver@...gle.com> wrote:
> I was afraid this would happen - could you try this patch series:
> https://lore.kernel.org/all/20240118110216.2539519-2-elver@google.com/ [1]

Thanks, this patch series definitely helped.
I can again work at the computer when something is compiling in the background.
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>

> In addition, could you give some additional details about the number
> of CPUs in your system?

Hardware probe: https://linux-hardware.org/?probe=ba941d7a4e
CPU: AMD Ryzen 7950x

> And if possible, do you have a way to measure performance besides the
> obvious lagging of the system? It would be interesting to know if the
> fix in [1] regains performance fully.

perf-2d5524635b00.data -
https://mega.nz/file/Q0ACSI4a#QQ8Ntbw5zvP_YZMsXPzSr-PxLVCw8fwg2RJaVOghoOQ
perf-773688a6cb24.data -
https://mega.nz/file/F8wAgBZI#OQ75qLFyf2diFXrDs9bP6_5xDevVrs1KlNdeupWSJSQ
perf-with-patchset.data -
https://mega.nz/file/l8ZXnI6Y#SmrZpH2Em6xzlIZgJe50PwSw-zLK_4whRjx3t_058kE

> perf diff perf-2d5524635b00.data perf-773688a6cb24.data
No kallsyms or vmlinux with build-id
c64a03a51e9503a251dbec8e5267fb3ae51914f2 was found
# Event 'cycles:P'
#
# Baseline  Delta Abs  Shared Object
Symbol

                        >
# ........  .........  ..............................................
...................................................................................................................................................................>
#
    59.91%    +23.05%  [kernel.vmlinux]
[k] 0xffffffff940065c0
    17.88%     -7.89%  cc1
[.] 0x0000000000207020
     9.39%     -6.30%  cc1plus
[.] 0x0000000000225110
     1.37%     -1.29%  libpython3.12.so.1.0
[.] 0x00000000000647e0
     1.16%     -0.84%  libcef.so
[.] 0x00000000021720e0
     1.27%     -0.67%  as
[.] 0x0000000000002090
     0.78%     -0.54%  steamclient.so
[.] 0x00000000001ed915
     0.77%     -0.33%  chrome
[.] 0x0000000002892080
     0.54%     -0.32%  libc.so.6
[.] _int_malloc
     0.30%     -0.23%  libpixman-1.so.0.43.0
[.] 0x00000000000078a7
     0.31%     -0.19%  libc.so.6
[.] _int_free


> perf diff perf-2d5524635b00.data perf-with-patchset.data
# Event 'cycles:P'
#
# Baseline  Delta Abs  Shared Object
Symbol

                        >
# ........  .........  ..............................................
...................................................................................................................................................................>
#
    17.88%    +12.61%  cc1
[.] 0x0000000000207020
               +3.89%  [kernel.vmlinux]
[k] unwind_next_frame
               +3.53%  [kernel.vmlinux]
[k] kasan_check_range
               +2.54%  [kernel.vmlinux]
[k] debug_check_no_obj_freed
     9.39%     +2.10%  cc1plus
[.] 0x0000000000225110
               +1.87%  [kernel.vmlinux]
[k] rcu_is_watching
               +1.41%  [kernel.vmlinux]
[k] lock_release
               +1.24%  [kernel.vmlinux]
[k] __orc_find
               +1.21%  [kernel.vmlinux]
[k] lock_acquire
               +1.08%  [kernel.vmlinux]
[k] stack_trace_consume_entry
               +1.08%  [kernel.vmlinux]
[k] check_preemption_disabled
     1.37%     +1.01%  libpython3.12.so.1.0
[.] 0x00000000000647e0
               +0.96%  [kernel.vmlinux]
[k] stack_access_ok
     1.27%     +0.79%  as
[.] 0x0000000000002090


Thanks!

-- 
Best Regards,
Mike Gavrilov.