From: Wu Fengguang <wfg@mail.ustc.edu.cn>
To: Hui Zhu <teawater@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH for vm-scalability] usemem: Add code for touch-alloc
Date: Sat, 10 Apr 2021 09:05:32 +0800 [thread overview]
Message-ID: <20210410010532.GA339619@wfg-e595> (raw)
In-Reply-To: <20210408134255.12330-1-teawater@gmail.com>
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 <teawater@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
>
prev parent reply other threads:[~2021-04-10 1:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-08 13:42 [PATCH for vm-scalability] usemem: Add code for touch-alloc Hui Zhu
2021-04-10 1:05 ` Wu Fengguang [this message]
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