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Date: Wed, 20 Dec 2023 19:15:37 +0530
From: Donet Tom <donettom@...ux.vnet.ibm.com>
To: Yu Zhao <yuzhao@...gle.com>, Kinsey Ho <kinseyho@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH mm-unstable v3 0/4] mm/mglru: Kconfig cleanup
On 12/20/23 09:46, Yu Zhao wrote:
> On Tue, Dec 19, 2023 at 9:01 PM Kinsey Ho <kinseyho@...gle.com> wrote:
>> This series is the result of the following discussion:
>> https://lore.kernel.org/47066176-bd93-55dd-c2fa-002299d9e034@linux.ibm.com/
>>
>> It mainly avoids building the code that walks page tables on CPUs that
>> use it, i.e., those don't support hardware accessed bit. Specifically,
>> it introduces a new Kconfig to guard some of functions added by
>> commit bd74fdaea146 ("mm: multi-gen LRU: support page table walks")
>> on CPUs like POWER9, on which the series was tested.
>>
>>
>> Kinsey Ho (4):
>> mm/mglru: add CONFIG_ARCH_HAS_HW_PTE_YOUNG
>> mm/mglru: add CONFIG_LRU_GEN_WALKS_MMU
>> mm/mglru: remove CONFIG_MEMCG
>> mm/mglru: remove CONFIG_TRANSPARENT_HUGEPAGE
>>
>> arch/Kconfig | 8 +
>> arch/arm64/Kconfig | 1 +
>> arch/x86/Kconfig | 1 +
>> arch/x86/include/asm/pgtable.h | 6 -
>> include/linux/memcontrol.h | 2 +-
>> include/linux/mm_types.h | 16 +-
>> include/linux/mmzone.h | 28 +---
>> include/linux/pgtable.h | 2 +-
>> kernel/fork.c | 2 +-
>> mm/Kconfig | 4 +
>> mm/vmscan.c | 271 ++++++++++++++++++---------------
>> 11 files changed, 174 insertions(+), 167 deletions(-)
> +Donet Tom <donettom@...ux.vnet.ibm.com>
> who is also working on this.
>
> Donet, could try this latest version instead? If it works well as the
> old one you've been using, can you please provide your Tested-by tag?
> Thanks.
Hi Yu Zhao,
This patch set looks promising.
I have conducted tests on PowerPC and x86.
In old patch set there is a cleanup patch which removes
struct scan_control *sc argument from try_to_inc_max_seq() and
run_aging(), Do we need to include that patch?
=>Here are some test results from PowerPC.
# ls -l vmscan.o
-rw-r--r--. 1 root root 3600080 Dec 19 22:35 vmscan.o
# size vmscan.o
text data bss dec hex filename
95086 27412 0 122498 1de82 vmscan.o
# ./scripts/bloat-o-meter vmscan.o.old vmscan.o
add/remove: 4/8 grow/shrink: 7/9 up/down: 860/-2524 (-1664)
Function old new delta
should_abort_scan - 472 +472
inc_max_seq.isra 1472 1612 +140
shrink_one 680 760 +80
lru_gen_release_memcg 508 556 +48
lru_gen_init_pgdat 92 132 +40
shrink_node 4040 4064 +24
lru_gen_online_memcg 680 696 +16
lru_gen_change_state 3968 3984 +16
------
shrink_lruvec 2168 2152 -16
lru_gen_seq_write 1980 1964 -16
isolate_folios 6904 6888 -16
lru_gen_init_memcg 32 12 -20
mm_list 24 - -24
lru_gen_exit_memcg 388 344 -44
try_to_shrink_lruvec 904 816 -88
lru_gen_rotate_memcg 832 700 -132
lru_gen_migrate_mm 132 - -132
lru_gen_seq_show 1484 1308 -176
iterate_mm_list_nowalk 288 - -288
lru_gen_look_around 2284 1984 -300
lru_gen_add_mm 528 - -528
lru_gen_del_mm 720 - -720
Total: Before=116213, After=114549, chg -1.43%
=>Here are some test results from x86.
$ ls -l vmscan.o
-rw-r--r--. 1 donettom donettom 2545792 Dec 20 15:16 vmscan.o
$ size vmscan.o
text data bss dec hex filename
109751 32189 0 141940 22a74 vmscan.o
$
$ ./scripts/bloat-o-meter vmscan.o.old vmscan.o
add/remove: 7/3 grow/shrink: 14/4 up/down: 2307/-1534 (773)
Function old new delta
inc_max_seq - 1470 +1470
should_abort_scan - 229 +229
isolate_folios 4469 4562 +93
lru_gen_rotate_memcg 641 731 +90
lru_gen_init_memcg 41 99 +58
lru_gen_release_memcg 282 336 +54
lru_gen_exit_memcg 306 350 +44
walk_pud_range 2502 2543 +41
shrink_node 2912 2951 +39
lru_gen_online_memcg 402 434 +32
lru_gen_seq_show 1112 1140 +28
lru_gen_add_folio 740 757 +17
lru_gen_look_around 1217 1233 +16
__pfx_should_abort_scan - 16 +16
__pfx_inc_max_seq - 16 +16
iterate_mm_list_nowalk 277 292 +15
shrink_one 413 426 +13
lru_gen_init_lruvec 190 202 +12
-----
try_to_shrink_lruvec 717 643 -74
lru_gen_init_pgdat 196 82 -114
try_to_inc_max_seq.isra 2897 1578 -1319
Total: Before=101095, After=101868, chg +0.76%
$
Tested-by: Donet Tom <donettom@...ux.vnet.ibm.com>
Thanks
Donet Tom
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