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[PATCH] x86_64 : vsyscall_gtod_data diet and vgettimeofday() fix

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From: Eric Dumazet <dada1@...>
To: Andrew Morton <akpm@...>
Cc: Andi Kleen <ak@...>, Linux kernel <linux-kernel@...>
Subject: [PATCH] x86_64 : vsyscall_gtod_data diet and vgettimeofday() fix
Date: Wednesday, March 28, 2007 - 1:33 pm

Hi Andrew

This patch should be applied after x86_64 : fix vtime() vsyscall

Thank you

[PATCH] x86_64 : vsyscall_gtod_data diet and vgettimeofday() fix

Current vsyscall_gtod_data is large (3 or 4 cache lines dirtied at timer 
interrupt). We can shrink it to exactly 64 bytes (1 cache line on AMD64)

Instead of copying a whole struct clocksource, we copy only needed fields.

I deleted an unused field : offset_base

This patch fixes one oddity in vgettimeofday(): It can returns a timeval with 
tv_usec = 1000000. Maybe not a bug, but why not doing the right thing ?

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
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Messages in current thread:
[PATCH] x86_64 : vsyscall_gtod_data diet and vgettimeofday()..., Eric Dumazet, (Wed Mar 28, 1:33 pm)
Re: [PATCH] x86_64 : vsyscall_gtod_data diet and vgettimeofd..., Andi Kleen, (Wed Mar 28, 2:55 pm)