Applied, thanks! On Thu, Apr 08, 2021 at 09:42:55PM +0800, Hui Zhu wrote:
Add code for touch-alloc. And Change read memory to write memory to avoid use the zero-page for reads in do_anonymous_page.Signed-off-by: Hui Zhu <teawa...@gmail.com> --- usemem.c | 34 ++++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-) diff --git a/usemem.c b/usemem.c index e2c46ec..5b90aae 100644 --- a/usemem.c +++ b/usemem.c @@ -329,6 +329,18 @@ void detach(void) } } +unsigned long do_access(unsigned long *p, unsigned long idx, int read) +{ + volatile unsigned long *vp = p; + + if (read) + return vp[idx]; /* read data */ + else { + vp[idx] = idx; /* write data */ + return 0; + } +} + unsigned long * allocate(unsigned long bytes) { unsigned long *p; @@ -355,6 +367,14 @@ unsigned long * allocate(unsigned long bytes) p = (unsigned long *)ALIGN((unsigned long)p, pagesize - 1); } + if (opt_touch_alloc) { + unsigned long i; + unsigned long m = bytes / sizeof(*p); + + for (i = 0; i < m; i += 1) + do_access(p, i, 0); + } + return p; } @@ -436,18 +456,6 @@ void shm_unlock(int seg_id) shmctl(seg_id, SHM_UNLOCK, NULL); } -unsigned long do_access(unsigned long *p, unsigned long idx, int read) -{ - volatile unsigned long *vp = p; - - if (read) - return vp[idx]; /* read data */ - else { - vp[idx] = idx; /* write data */ - return 0; - } -} - #define NSEC_PER_SEC (1UL * 1000 * 1000 * 1000) long nsec_sub(long nsec1, long nsec2) @@ -953,6 +961,8 @@ int main(int argc, char *argv[]) opt_punch_holes = 1; } else if (strcmp(opts[opt_index].name, "init-time") == 0) { opt_init_time = 1; + } else if (strcmp(opts[opt_index].name, "touch-alloc") == 0) { + opt_touch_alloc = 1; } else usage(1); break; -- 2.17.1
