From: Richard Weinberger <richard@nod.at>
To: anton ivanov <anton.ivanov@cambridgegreys.com>
Cc: linux-um <linux-um@lists.infradead.org>
Subject: Re: [PATCH] um: allow using glibc string functions instead of generics
Date: Tue, 10 Nov 2020 21:13:45 +0100 (CET) [thread overview]
Message-ID: <1098264641.290574.1605039225057.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <20201110163034.22963-1-anton.ivanov@cambridgegreys.com>
----- Ursprüngliche Mail -----
> Von: "anton ivanov" <anton.ivanov@cambridgegreys.com>
> An: "linux-um" <linux-um@lists.infradead.org>
> CC: "richard" <richard@nod.at>, "anton ivanov" <anton.ivanov@cambridgegreys.com>
> Gesendet: Dienstag, 10. November 2020 17:30:34
> Betreff: [PATCH] um: allow using glibc string functions instead of generics
> From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
>
> UML kernel runs as a normal userspace process and can use the
> optimized glibc strings functions like strcpy, memcpy, etc.
>
> The support is optional and is turned on/of using a config
> option.
>
> Using glibc functions results in a slightly smaller executable
> when linked dynamically as well as anything between 1% and 5%
> performance improvements.
On what workload did you see such a huge performance improvement?
The in-kernel variants of memcpy and such are already well optimized.
So I'm a little surprised.
Thanks,
//richard
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next prev parent reply other threads:[~2020-11-10 20:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 16:30 [PATCH] um: allow using glibc string functions instead of generics anton.ivanov
2020-11-10 16:40 ` Johannes Berg
2020-11-10 16:54 ` Anton Ivanov
2020-11-10 20:13 ` Richard Weinberger [this message]
2020-11-10 20:56 ` Anton Ivanov
2020-11-10 21:29 ` Richard Weinberger
2020-11-10 21:33 ` Anton Ivanov
2020-11-10 21:39 ` Richard Weinberger
2020-11-11 7:13 ` Anton Ivanov
2020-11-11 8:26 ` Anton Ivanov
2020-11-11 15:14 ` Anton Ivanov
2020-11-11 15:59 ` Anton Ivanov
2020-11-11 18:09 ` Anton Ivanov
2020-11-11 9:49 ` Anton Ivanov
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