summaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/flush.c
diff options
context:
space:
mode:
authorMing Lei <tom.leiming@gmail.com>2013-05-18 11:21:36 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-05-23 00:09:45 +0100
commitb2a234ed6417cf88bdbf4b22700e0ae6e08653ce (patch)
tree443a479725c27d94ff0851abe851399fd0eb2934 /arch/arm/mm/flush.c
parent9b97173e785a54c5df0aa23d1e1f680f61e36e43 (diff)
downloadlinux-b2a234ed6417cf88bdbf4b22700e0ae6e08653ce.tar.bz2
ARM: 7730/1: DMA-mapping: mark all !DMA_TO_DEVICE pages in unmapping as clean
It is common for one sg to include many pages, so mark all these pages as clean to avoid unnecessary flushing on them in set_pte_at() or update_mmu_cache(). The patch might improve loading performance of applciation code a bit. On the below test code to read file(~1GByte size) from usb mass storage disk to buffer created with mmap(PROT_READ | PROT_EXEC) on Pandaboard, average ~1% improvement can be observed with the patch on 10 times test. unsigned int sum = 0; static unsigned long tv_diff(struct timeval *tv1, struct timeval *tv2) { return (tv2->tv_sec - tv1->tv_sec) * 1000000 + (tv2->tv_usec - tv1->tv_usec); } int main(int argc, char *argv[]) { char *mbuffer; int fd; int i; unsigned long page_size, size; struct stat stat; struct timeval t1, t2; page_size = getpagesize(); fd = open(argv[1], O_RDONLY); assert(fd >= 0); fstat(fd, &stat); size = stat.st_size; printf("%s: file %s, file size %lu, page size %lun", argv[0], read_filename, size, page_size); gettimeofday(&t1, NULL); mbuffer = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0); for (i = 0 ; i < size ; i += page_size) sum += mbuffer[i]; munmap(mbuffer, page_size); gettimeofday(&t2, NULL); printf("tread mmaped time: %luusn", tv_diff(&t1, &t2)); close(fd); } Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/flush.c')
0 files changed, 0 insertions, 0 deletions