From: Milton Miller <miltonm@bga.com>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: [PATCH 0/6] xics.c and time.c optimizations
Date: Thu, 13 Dec 2007 22:51:26 -0600 (CST) [thread overview]
Message-ID: <mm-cpu-0@bga.com> (raw)
The following patches against for-2.2.25 do some optimizations related
to the usage smp_processor_id().
The xics one has been tested on SMP on 2.6.23, and still applies cleanly.
In time.c I started with the per_cpu to __get_cpu_var transformations
which affect ppc64 (the calls were added in 2.6.24), and from there
went looking for redundant global accesses from objdump -d --reloc.
I primarly looked at the pseries_defconfig and checked the results on
chrp32_defconfig.
Optimization results were checked on debian using
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
milton
next reply other threads:[~2007-12-14 4:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-14 4:51 Milton Miller [this message]
2007-12-14 4:52 ` [PATCH 1/6] push down or eliminate smp_processor_id in xics Milton Miller
2007-12-14 4:52 ` [PATCH 2/6] init_decrementer_clockevent can be static __init Milton Miller
2007-12-14 4:52 ` [PATCH 3/6] use __get_cpu_var in time.c Milton Miller
2007-12-14 4:52 ` [PATCH 4/6] timer interrupt: use a struct for two per_cpu varables Milton Miller
2007-12-14 4:52 ` [PATCH 5/6] depend on ->initialized in calc_steal_time Milton Miller
2007-12-14 4:52 ` [PATCH 6/6] optimize account_system_vtime Milton Miller
2007-12-15 2:10 ` Michael Neuling
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