From: Honggyu Kim <honggyu.kim@sk.com>
To: Gregory Price <gourry@gourry.net>, Byungchul Park <byungchul@sk.com>
Cc: kernel_team@skhynix.com, Matthew Wilcox <willy@infradead.org>,
Hyeonggon Yoo <42.hyeyoo@gmail.com>,
lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org,
linux-cxl@vger.kernel.org
Subject: Re: [LSF/MM/BPF TOPIC] Restricting or migrating unmovable kernel allocations from slow tier
Date: Fri, 7 Feb 2025 18:34:43 +0900 [thread overview]
Message-ID: <ada54160-461c-4942-a4dc-43f7eab0f1bf@sk.com> (raw)
In-Reply-To: <Z6XLCeU0vjIOYGKe@gourry-fedora-PF4VCD3F>
Hi Gregory,
On 2/7/2025 5:57 PM, Gregory Price wrote:
[...snip...]
>> and kernel stack,
>
> The default kernel stack size is like 16kb. You'd need like 100,000
> threads to eat up 1.5GB, and 2048 threads only eats like 32MB.
>
> It's not an interesting amount of memory if you have a 20TB system.
The amount might be small, but having those data in slow tier can
make performance degradation if it is heavily accessed.
The number of accesses isn't linearly corelated to the size of the
memory region.
Thanks,
Honggyu
next prev parent reply other threads:[~2025-02-07 9:34 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-01 13:29 Hyeonggon Yoo
2025-02-01 14:04 ` Matthew Wilcox
2025-02-01 15:13 ` Hyeonggon Yoo
2025-02-01 16:30 ` Gregory Price
2025-02-01 18:48 ` Matthew Wilcox
2025-02-03 22:09 ` Dan Williams
2025-02-07 7:20 ` Byungchul Park
2025-02-07 8:57 ` Gregory Price
2025-02-07 9:27 ` Gregory Price
2025-02-07 9:34 ` Honggyu Kim [this message]
2025-02-07 9:54 ` Gregory Price
2025-02-07 10:49 ` Byungchul Park
2025-02-10 2:33 ` Harry (Hyeonggon) Yoo
2025-02-10 3:19 ` Matthew Wilcox
2025-02-10 6:00 ` Gregory Price
2025-02-10 7:17 ` Byungchul Park
2025-02-10 15:47 ` Gregory Price
2025-02-10 15:55 ` Matthew Wilcox
2025-02-10 16:06 ` Gregory Price
2025-02-11 1:53 ` Byungchul Park
2025-02-21 1:52 ` Harry Yoo
2025-02-25 4:54 ` [LSF/MM/BPF TOPIC] Gathering ideas to reduce ZONE_NORMAL cost Byungchul Park
2025-02-25 5:06 ` [LSF/MM/BPF TOPIC] Restricting or migrating unmovable kernel allocations from slow tier Byungchul Park
2025-03-03 15:55 ` Gregory Price
2025-02-07 10:14 ` Byungchul Park
2025-02-10 7:02 ` Byungchul Park
2025-02-04 9:59 ` David Hildenbrand
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