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Date: Mon, 14 Mar 2016 11:55:15 +0900
From: Masanori Ogino <>
Subject: Re: musl without atomic instructions?

2016-03-14 11:13 GMT+09:00 Rich Felker <>:
> IMO a vdso function should be added that makes the syscall, rather
> than having libc call the syscall directly; this would allow the
> kernel to automatically provide a better implementation in the future
> without the need to rebuild applications. Using a syscall for this is
> very slow. Working with kernel people to propose such a thing (or even
> implementing it and submitting kernel patches) is certainly one option
> for something to add to a GSoC project proposal to make it more
> substantial.

Well, it seems that I don't really understand vDSO.

My current understanding is, vDSO make it possible that:

1. programs targeting without-A processors use syscalls on without-A
processors, and
2. the programs use atomic instructions on with-A processors. (no
interruption, no context switching!)
(3. programs targeting with-A processors runs normally, without
calling such vDSO function)

Is it correct? If so, it would be really nice.

Masanori Ogino

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