[PATCH] x86-64: vsyscall_gtod_data diet and vgettimeofday() fix

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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>
Signed-off-by: Andi Kleen <ak@suse.de>

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Eric Dumazet 2007-05-02 19:27:11 +02:00 • committed by Andi Kleen

parent 272a3713bb

commit c8118c6c07

1 changed files with 36 additions and 17 deletions

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arch/x86_64/kernel/vsyscall.c

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