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| author | Stephane Eranian <eranian@hpl.hp.com> | 2006-09-26 10:52:28 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:28 +0200 |
| commit | d3a4f48d4866b8623ca9adde8ce4e5fde979c132 (patch) | |
| tree | 04413a1f18c6f49688d6008b583b20a287920a0f /drivers/char/hpet.c | |
| parent | 2f766d16062d0147edff91be15de4a950667ca42 (diff) | |
| download | op-kernel-dev-d3a4f48d4866b8623ca9adde8ce4e5fde979c132.zip op-kernel-dev-d3a4f48d4866b8623ca9adde8ce4e5fde979c132.tar.gz | |
[PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw
Hello,
Following my discussion with Andi. Here is a patch that introduces
two new TIF flags to simplify the context switch code in __switch_to().
The idea is to minimize the number of cache lines accessed in the common
case, i.e., when neither the debug registers nor the I/O bitmap are used.
This patch covers the x86-64 modifications. A patch for i386 follows.
Changelog:
- add TIF_DEBUG to track when debug registers are active
- add TIF_IO_BITMAP to track when I/O bitmap is used
- modify __switch_to() to use the new TIF flags
<signed-off-by>: eranian@hpl.hp.com
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'drivers/char/hpet.c')
0 files changed, 0 insertions, 0 deletions
