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f36bbf21e8
linux_dsm_epyc7002/arch/powerpc
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Christophe Leroy f36bbf21e8 powerpc/lib: optimise 32 bits __clear_user() 
Rewrite clear_user() on the same principle as memset(0), making use
of dcbz to clear complete cache lines.

This code is a copy/paste of memset(), with some modifications
in order to retrieve remaining number of bytes to be cleared,
as it needs to be returned in case of error.

On the same way as done on PPC64 in commit 17968fbbd1
("powerpc: 64bit optimised __clear_user"), the patch moves
__clear_user() into a dedicated file string_32.S

On a MPC885, throughput is almost doubled:

Before:
~# dd if=/dev/zero of=/dev/null bs=1M count=1000
1048576000 bytes (1000.0MB) copied, 18.990779 seconds, 52.7MB/s

After:
~# dd if=/dev/zero of=/dev/null bs=1M count=1000
1048576000 bytes (1000.0MB) copied, 9.611468 seconds, 104.0MB/s

On a MPC8321, throughput is multiplied by 2.12:

Before:
root@vgoippro:~# dd if=/dev/zero of=/dev/null bs=1M count=1000
1048576000 bytes (1000.0MB) copied, 6.844352 seconds, 146.1MB/s

After:
root@vgoippro:~# dd if=/dev/zero of=/dev/null bs=1M count=1000
1048576000 bytes (1000.0MB) copied, 3.218854 seconds, 310.7MB/s

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-06-04 00:39:21 +10:00
..
boot powerpc/boot: remove unused variable in mpc8xx 2018-06-04 00:39:17 +10:00
configs powerpc/config: powernv_defconfig updates 2018-05-10 23:25:07 +10:00
crypto crypto: hash - annotate algorithms taking optional key 2018-01-12 23:03:35 +11:00
include powerpc/time: inline arch_vtime_task_switch() 2018-06-04 00:39:20 +10:00
kernel powerpc/time: inline arch_vtime_task_switch() 2018-06-04 00:39:20 +10:00
kvm Merge branch 'topic/ppc-kvm' into next 2018-05-15 22:28:19 +10:00
lib powerpc/lib: optimise 32 bits __clear_user() 2018-06-04 00:39:21 +10:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm powerpc/mm: Remove stale_map[] handling on non SMP processors 2018-06-04 00:39:16 +10:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-05 11:29:24 -08:00
oprofile powerpc: Use sizeof(*foo) rather than sizeof(struct foo) 2018-03-20 16:47:53 +11:00
perf powerpc/perf: Unregister thread-imc if core-imc not supported 2018-06-03 20:43:37 +10:00
platforms powerpc/8xx: Remove RTC clock on 88x 2018-06-04 00:39:18 +10:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev powerpc/xics: Add missing of_node_put() in error path 2018-06-03 20:43:35 +10:00
tools powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS 2018-06-01 23:08:09 +10:00
xmon powerpc/64: Save stack pointer when we hard disable interrupts 2018-06-03 20:43:42 +10:00
Kconfig powerpc: always enable RTC_LIB 2018-06-03 20:43:33 +10:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/Makefile: set -mcpu=860 flag for the 8xx 2018-06-04 00:39:20 +10:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00