This patch to enable early boot timestamps on SPARC. I have previously submitted this patch together with console fixes, and now decoupled them so they can be reviewed faster, and independently. Differences from the previous submission is that I added an offset to always show timestamps from 0, the same as it is done on other platforms. And, there are also some performance optimizations in sched_clock(). The final performance of sched_clock() is even faster than now: the same number of loads, but all of them are coming from the same cacheline. Current sched_clock(): sethi %hi(0xb9b400), %g1 ldx [ %g1 + 0x250 ], %g1 ldx [ %g1 ], %g1 call %g1 nop sethi %hi(0xb9b400), %g1 ldx [ %g1 + 0x300 ], %g1 mulx %o0, %g1, %g1 rett %i7 + 8 srlx %g1, 0xa, %o0 Final sched_clock(): sethi %hi(0xb9b400), %g2 ldx [ %g2 + 0x2d0 ], %g1 ldx [ %g2 + 0x2c0 ], %l1 call %g1 ldx [ %g2 + 0x2c8 ], %l0 mulx %o0, %l1, %l1 srlx %l1, 0xa, %i0 sub %i0, %l0, %i0 rett %i7 + 8 nop Pavel Tatashin (6): sparc64: remove trailing white spaces sparc64: access tick function from variable sparc64: show time stamps from zero sparc64: optimize loads in clock_sched() sparc64: improve modularity tick options sparc64: initialize time early arch/sparc/include/asm/setup.h | 2 +- arch/sparc/include/asm/timer_64.h | 7 ++ arch/sparc/kernel/kernel.h | 3 + arch/sparc/kernel/setup_64.c | 7 +- arch/sparc/kernel/time_64.c | 121 ++++++++++++++++++++++++------------- 5 files changed, 93 insertions(+), 47 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
