From: Matthew Wilcox <willy@infradead.org>
To: Huang Shijie <shijie@os.amperecomputing.com>
Cc: viro@zeniv.linux.org.uk, akpm@linux-foundation.org,
jlayton@kernel.org, bfields@fieldses.org,
torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
song.bao.hua@hisilicon.com, patches@amperecomputing.com,
zwang@amperecomputing.com
Subject: Re: [RFC PATCH] fs/exec: Add the support for ELF program's NUMA replication
Date: Mon, 6 Sep 2021 13:09:22 +0100 [thread overview]
Message-ID: <YTYE8tBNAhK0MXsY@casper.infradead.org> (raw)
In-Reply-To: <20210906161613.4249-1-shijie@os.amperecomputing.com>
On Mon, Sep 06, 2021 at 04:16:13PM +0000, Huang Shijie wrote:
> This patch adds AT_NUMA_REPLICATION for execveat().
>
> If this flag is set, the kernel will trigger COW(copy on write)
> on the mmapped ELF binary. So the program will have a copied-page
> on its NUMA node, even if the original page in page cache is
> on other NUMA nodes.
This does absolutely nothing for programs which run on multiple NUMA
nodes at the same time.
Also, I dislike the abuse of the term "COW" for this. It's COF --
Copy On Fault.
next prev parent reply other threads:[~2021-09-06 12:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-06 16:16 Huang Shijie
2021-09-06 9:35 ` David Hildenbrand
2021-09-09 9:46 ` Huang Shijie
2021-09-09 8:58 ` David Hildenbrand
2021-09-06 12:09 ` Matthew Wilcox [this message]
2021-09-09 9:48 ` Huang Shijie
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