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Date: Tue, 31 Mar 2009 03:00:28 +0300
From: Izik Eidus <ieidus@...hat.com>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-mm@...ck.org, avi@...hat.com, aarcange@...hat.com,
chrisw@...hat.com, riel@...hat.com, jeremy@...p.org,
mtosatti@...hat.com, hugh@...itas.com, corbet@....net,
yaniv@...hat.com, dmonakhov@...nvz.org,
Izik Eidus <ieidus@...hat.com>
Subject: [PATCH 2/2] qemu: add ksmctl.
userspace tool to control the ksm kernel thread
Signed-off-by: Izik Eidus <ieidus@...hat.com>
---
user/Makefile | 6 +++-
user/config-x86-common.mak | 2 +-
user/ksmctl.c | 69 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 75 insertions(+), 2 deletions(-)
create mode 100644 user/ksmctl.c
diff --git a/user/Makefile b/user/Makefile
index cf7f8ed..a291b37 100644
--- a/user/Makefile
+++ b/user/Makefile
@@ -39,6 +39,10 @@ autodepend-flags = -MMD -MF $(dir $*).$(notdir $*).d
LDFLAGS += -pthread -lrt
+ksmctl_objs= ksmctl.o
+ksmctl: $(ksmctl_objs)
+ $(CC) $(LDFLAGS) $^ -o $@
+
kvmtrace_objs= kvmtrace.o
kvmctl: $(kvmctl_objs)
@@ -56,4 +60,4 @@ $(libcflat): $(cflatobjs)
-include .*.d
clean: arch_clean
- $(RM) kvmctl kvmtrace *.o *.a .*.d $(libcflat) $(cflatobjs)
+ $(RM) ksmctl kvmctl kvmtrace *.o *.a .*.d $(libcflat) $(cflatobjs)
diff --git a/user/config-x86-common.mak b/user/config-x86-common.mak
index e789fd4..4303aee 100644
--- a/user/config-x86-common.mak
+++ b/user/config-x86-common.mak
@@ -1,6 +1,6 @@
#This is a make file with common rules for both x86 & x86-64
-all: kvmctl kvmtrace test_cases
+all: ksmctl kvmctl kvmtrace test_cases
kvmctl_objs= main.o iotable.o ../libkvm/libkvm.a
balloon_ctl: balloon_ctl.o
diff --git a/user/ksmctl.c b/user/ksmctl.c
new file mode 100644
index 0000000..034469f
--- /dev/null
+++ b/user/ksmctl.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include "../qemu/ksm.h"
+
+int main(int argc, char *argv[])
+{
+ int fd;
+ int used = 0;
+ int fd_start;
+ struct ksm_kthread_info info;
+
+
+ if (argc < 2) {
+ fprintf(stderr, "usage: %s {start npages sleep | stop | info}\n", argv[0]);
+ exit(1);
+ }
+
+ fd = open("/dev/ksm", O_RDWR | O_TRUNC, (mode_t)0600);
+ if (fd == -1) {
+ fprintf(stderr, "could not open /dev/ksm\n");
+ exit(1);
+ }
+
+ if (!strncmp(argv[1], "start", strlen(argv[1]))) {
+ used = 1;
+ if (argc < 4) {
+ fprintf(stderr,
+ "usage: %s start npages_to_scan sleep\n",
+ argv[0]);
+ exit(1);
+ }
+ info.pages_to_scan = atoi(argv[2]);
+ info.sleep = atoi(argv[3]);
+ info.flags = ksm_control_flags_run;
+
+ fd_start = ioctl(fd, KSM_START_STOP_KTHREAD, &info);
+ if (fd_start == -1) {
+ fprintf(stderr, "KSM_START_KTHREAD failed\n");
+ exit(1);
+ }
+ printf("created scanner\n");
+ }
+
+ if (!strncmp(argv[1], "stop", strlen(argv[1]))) {
+ used = 1;
+ info.flags = 0;
+ fd_start = ioctl(fd, KSM_START_STOP_KTHREAD, &info);
+ printf("stopped scanner\n");
+ }
+
+ if (!strncmp(argv[1], "info", strlen(argv[1]))) {
+ used = 1;
+ ioctl(fd, KSM_GET_INFO_KTHREAD, &info);
+ printf("flags %d, pages_to_scan %d, sleep_time %d\n",
+ info.flags, info.pages_to_scan, info.sleep);
+ }
+
+ if (!used)
+ fprintf(stderr, "unknown command %s\n", argv[1]);
+
+ return 0;
+}
--
1.5.6.5
--
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