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dca230f00d
linux/arch/arm/lib
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Kirill A. Shutemov dca230f00d ARM: 5701/1: ARM: copy_page.S: take into account the size of the cache line 
Optimized version of copy_page() was written with assumption that cache
line size is 32 bytes. On Cortex-A8 cache line size is 64 bytes.

This patch tries to generalize copy_page() to work with any cache line
size if cache line size is multiple of 16 and page size is multiple of
two cache line size.

After this optimization we've got ~25% speedup on OMAP3(tested in
userspace).

There is test for kernelspace which trigger copy-on-write after fork():

 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>

 #define BUF_SIZE (10000*4096)
 #define NFORK 200

 int main(int argc, char **argv)
 {
         char *buf = malloc(BUF_SIZE);
         int i;

         memset(buf, 0, BUF_SIZE);

         for(i = 0; i < NFORK; i++) {
                 if (fork()) {
                         wait(NULL);
                 } else {
                         int j;

                         for(j = 0; j < BUF_SIZE; j+= 4096)
                                 buf[j] = (j & 0xFF) + 1;
                         break;
                 }
         }

         free(buf);
         return 0;
 }

Before optimization this test takes ~66 seconds, after optimization
takes ~56 seconds.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@nokia.com>
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-15 22:07:02 +01:00
..
ashldi3.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
ashrdi3.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
backtrace.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
bitops.h Complete irq tracing support for ARM 2009-08-13 20:34:37 +02:00
changebit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
clear_user.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
clearbit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
copy_from_user.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
copy_page.S ARM: 5701/1: ARM: copy_page.S: take into account the size of the cache line 2009-09-15 22:07:02 +01:00
copy_template.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
copy_to_user.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
csumipv6.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
csumpartial.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
csumpartialcopy.S [ARM] 5231/1: Do not save the frame pointer in the csum_partial_copy_* functions 2008-09-01 12:06:35 +01:00
csumpartialcopygeneric.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
csumpartialcopyuser.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
delay.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
div64.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
ecard.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
findbit.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
floppydma.S
getuser.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
io-acorn.S
io-readsb.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
io-readsl.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
io-readsw-armv3.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
io-readsw-armv4.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
io-shark.c
io-writesb.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
io-writesl.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
io-writesw-armv3.S [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
io-writesw-armv4.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
lib1funcs.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
lshrdi3.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
Makefile [ARM] alternative copy_to_user/clear_user implementation 2009-05-29 22:36:45 -04:00
memchr.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
memcpy.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
memmove.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
memset.S [ARM] remove memzero() 2008-11-27 12:37:59 +00:00
memzero.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
muldi3.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
putuser.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
setbit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
sha1.S Thumb-2: Add some .align statements to the .S files 2009-07-24 12:32:52 +01:00
strchr.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
strncpy_from_user.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
strnlen_user.S Thumb-2: Implement the unified arch/arm/lib functions 2009-07-24 12:32:57 +01:00
strrchr.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
testchangebit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
testclearbit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
testsetbit.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
uaccess_with_memcpy.c [ARM] alternative copy_to_user: more precise fallback threshold 2009-05-30 01:10:15 -04:00
uaccess.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
ucmpdi2.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00