Anton Blanchard 789c299ca2 powerpc: Improve 64bit copy_tofrom_user ... Here is a patch from Paul Mackerras that improves the ppc64 copy_tofrom_user. The loop now does 32 bytes at a time and as well as pairing loads and stores. A quick test case that reads 8kB over and over shows the improvement: POWER6: 53% faster POWER7: 51% faster #define _XOPEN_SOURCE 500 #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> #define BUFSIZE (8 * 1024) #define ITERATIONS 10000000 int main() { char tmpfile[] = "/tmp/copy_to_user_testXXXXXX"; int fd; char *buf[BUFSIZE]; unsigned long i; fd = mkstemp(tmpfile); if (fd < 0) { perror("open"); exit(1); } if (write(fd, buf, BUFSIZE) != BUFSIZE) { perror("open"); exit(1); } for (i = 0; i < 10000000; i++) { if (pread(fd, buf, BUFSIZE, 0) != BUFSIZE) { perror("pread"); exit(1); } } unlink(tmpfile); return 0; } Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>		2010-02-17 14:03:16 +11:00
..
alloc.c
checksum_32.S
checksum_64.S
code-patching.c
copy_32.S	powerpc/8xx: Start using dcbX instructions in various copy routines	2009-12-09 17:10:37 +11:00
copypage_64.S	powerpc: Pair loads and stores in copy_4k_page	2010-02-17 14:03:16 +11:00
copyuser_64.S	powerpc: Improve 64bit copy_tofrom_user	2010-02-17 14:03:16 +11:00
crtsavres.S
devres.c
div64.S
feature-fixups-test.S
feature-fixups.c	powerpc: Fix lwsync patching code on 64bit	2010-02-17 14:03:15 +11:00
locks.c	locking: Convert raw_rwlock to arch_rwlock	2009-12-14 23:55:32 +01:00
Makefile
mem_64.S
memcpy_64.S
rheap.c
sstep.c
string.S
usercopy_64.c