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4c5fe5db1a
linux/arch/parisc/kernel
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John David Anglin 4c5fe5db1a parisc: Optimze cache flush algorithms 
The attached patch implements three optimizations:

1) Loops in flush_user_dcache_range_asm, flush_kernel_dcache_range_asm,
purge_kernel_dcache_range_asm, flush_user_icache_range_asm, and
flush_kernel_icache_range_asm are unrolled to reduce branch overhead.

2) The static branch prediction for cmpb instructions in pacache.S have
been reviewed and the operand order adjusted where necessary.

3) For flush routines in cache.c, we purge rather flush when we have no
context.  The pdc instruction at level 0 is not required to write back
dirty lines to memory. This provides a performance improvement over the
fdc instruction if the feature is implemented.

Version 2 adds alternative patching.

The patch provides an average improvement of about 2%.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
2018-10-20 21:10:26 +02:00
..
.gitignore parisc: add arch/parisc/kernel/.gitignore 2008-10-10 16:32:28 +00:00
asm-offsets.c parisc: Drop per_cpu uaccess related exception_data struct 2017-05-10 17:46:13 +02:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.c parisc: Optimze cache flush algorithms 2018-10-20 21:10:26 +02:00
compat_audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
drivers.c parisc: Convert printk(KERN_LEVEL) to pr_lvl() 2018-06-28 17:14:44 +02:00
entry.S parisc: Drop two instructions from pte lookup code 2018-10-19 22:22:06 +02:00
firmware.c parisc: Add PDC PAT cell_info() and pd_get_pdc_revisions() functions 2018-10-19 22:22:07 +02:00
ftrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hardware.c parisc: Move various functions and strings to init section 2018-03-27 18:52:21 +02:00
head.S parisc: Check if secondary CPUs want own PDC calls 2018-03-02 10:04:46 +01:00
hpmc.S parisc: Fix exported address of os_hpmc handler 2018-10-17 08:18:01 +02:00
inventory.c parisc: Add Page Deallocation Table (PDT) support 2017-05-12 09:14:15 +02:00
irq.c parisc: Increase thread and stack size to 32kb 2017-07-31 08:41:26 +02:00
Makefile parisc: Fix missing binfmt_elf32.o build error 2018-04-14 11:17:59 +02:00
module.c parisc64: Add .opd based function descriptor dereference 2018-01-09 10:45:38 +01:00
pa7300lc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pacache.S parisc: Optimze cache flush algorithms 2018-10-20 21:10:26 +02:00
parisc_ksyms.c parisc: Export __cmpxchg_u64 unconditionally 2017-10-19 08:48:45 +02:00
pci-dma.c parisc: use generic dma_noncoherent_ops 2018-08-13 09:30:32 +02:00
pci.c parisc: Fix section mismatches 2018-05-02 21:47:35 +02:00
pdc_chassis.c proc: introduce proc_create_single{,_data} 2018-05-16 07:23:35 +02:00
pdc_cons.c treewide: Switch DEFINE_TIMER callbacks to struct timer_list * 2017-11-21 15:57:05 -08:00
pdt.c mm/memory_failure: Remove unused trapno from memory_failure 2018-01-23 12:17:42 -06:00
perf_asm.S Revert "parisc: fix trivial section name warnings" 2008-06-13 10:49:45 -04:00
perf_images.h
perf.c parisc: Static initialization of spinlocks in perf and unwind code 2017-08-22 16:34:33 +02:00
process.c parisc: Fix and improve kernel stack unwinding 2018-08-13 09:54:17 +02:00
processor.c parisc: Add hardware description to stack traces 2018-08-21 14:46:26 +02:00
ptrace.c parisc: Add HAVE_REGS_AND_STACK_ACCESS_API feature 2018-08-13 09:30:50 +02:00
real2.S parisc: Fix and improve kernel stack unwinding 2018-08-13 09:54:17 +02:00
setup.c parisc: Add alternative coding infrastructure 2018-10-17 17:22:26 +02:00
signal32.c signal: Unify and correct copy_siginfo_to_user32 2018-01-15 19:56:20 -06:00
signal32.h signal: Unify and correct copy_siginfo_to_user32 2018-01-15 19:56:20 -06:00
signal.c parisc: Add alternative coding infrastructure 2018-10-17 17:22:26 +02:00
smp.c parisc: Move setup_profiling_timer() out of init section 2018-05-18 16:21:49 +02:00
stacktrace.c parisc: Consolidate unwind initialization calls 2018-08-17 17:00:08 +02:00
sys_parisc32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_parisc.c parisc: Restore possibility to execute 64-bit applications 2018-08-17 16:45:24 +02:00
syscall_table.S parisc: Wire up io_pgetevents syscall 2018-06-28 17:43:00 +02:00
syscall.S parisc: Release spinlocks using ordered store 2018-10-17 08:18:01 +02:00
time.c parisc: time: Convert read_persistent_clock() to read_persistent_clock64() 2018-04-20 20:18:21 +02:00
topology.c parisc: Add CPU topology support 2017-11-17 15:27:22 +01:00
traps.c parisc: Fix address in HPMC IVA 2018-10-17 08:18:01 +02:00
unaligned.c signal/parisc: Use force_sig_fault where appropriate 2018-04-25 10:44:06 -05:00
unwind.c parisc: Fix boot failure of 64-bit kernel 2018-08-21 14:32:44 +02:00
vmlinux.lds.S parisc: Add alternative coding infrastructure 2018-10-17 17:22:26 +02:00