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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] libxenlight: implement libxl_set_memory_target
Hi all,
this patch adds a target_memkb parameter to libxl_domain_build_info to
set the target memory for the VM at build time and a new function
called libxl_set_memory_target to dynamically modify the memory target
of a VM at run time.
Finally a new command "mem-set" is added to xl that calls directly
libxl_set_memory_target.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
diff -r fe3c8ba27d2f tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Tue Dec 08 17:02:15 2009 +0000
+++ b/tools/libxl/libxl.c Tue Dec 08 17:14:35 2009 +0000
@@ -935,6 +935,7 @@
memset(&b_info, 0x00, sizeof(libxl_domain_build_info));
b_info.max_vcpus = 1;
b_info.max_memkb = 32 * 1024;
+ b_info.target_memkb = b_info.max_memkb;
b_info.kernel = "/usr/lib/xen/boot/ioemu-stubdom.gz";
b_info.u.pv.cmdline = libxl_sprintf(ctx, " -d %d", info->domid);
b_info.u.pv.ramdisk = "";
@@ -2264,6 +2265,7 @@
b_info->vpt_align = -1;
b_info->max_vcpus = 1;
b_info->max_memkb = 32 * 1024;
+ b_info->target_memkb = b_info->max_memkb;
if (c_info->hvm) {
b_info->shadow_memkb =
libxl_get_required_shadow_memory(b_info->max_memkb, b_info->max_vcpus);
b_info->video_memkb = 8 * 1024;
@@ -2356,4 +2358,22 @@
console->build_state = state;
}
+int libxl_set_memory_target(struct libxl_ctx *ctx, uint32_t domid, uint32_t
target_memkb)
+{
+ int rc = 0;
+ uint32_t videoram;
+ char *videoram_s = NULL;
+ char *dompath = libxl_xs_get_dompath(ctx, domid);
+ videoram_s = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx,
"%s/memory/videoram", dompath));
+ if (!videoram_s)
+ return -1;
+ videoram = atoi(videoram_s);
+
+ libxl_xs_write(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/memory/target",
dompath), "%lu", target_memkb);
+ if ((rc = xc_domain_setmaxmem(ctx->xch, domid, target_memkb +
LIBXL_MAXMEM_CONSTANT)) != 0) return rc;
+ rc = xc_domain_memory_set_pod_target(ctx->xch, domid, (target_memkb -
videoram) / 4, NULL, NULL, NULL);
+ return rc;
+}
+
+
diff -r fe3c8ba27d2f tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Tue Dec 08 17:02:15 2009 +0000
+++ b/tools/libxl/libxl.h Tue Dec 08 17:14:35 2009 +0000
@@ -66,6 +66,7 @@
int max_vcpus;
int cur_vcpus;
uint32_t max_memkb;
+ uint32_t target_memkb;
uint32_t video_memkb;
uint32_t shadow_memkb;
const char *kernel;
@@ -305,6 +306,8 @@
int libxl_domain_pause(struct libxl_ctx *ctx, uint32_t domid);
int libxl_domain_unpause(struct libxl_ctx *ctx, uint32_t domid);
+int libxl_set_memory_target(struct libxl_ctx *ctx, uint32_t domid, uint32_t
target_memkb);
+
int libxl_console_attach(struct libxl_ctx *ctx, uint32_t domid, int cons_num);
struct libxl_dominfo * libxl_domain_list(struct libxl_ctx *ctx, int
*nb_domain);
diff -r fe3c8ba27d2f tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c Tue Dec 08 17:02:15 2009 +0000
+++ b/tools/libxl/libxl_dom.c Tue Dec 08 17:14:35 2009 +0000
@@ -52,7 +52,7 @@
if (info->vpt_align != -1)
xc_set_hvm_param(ctx->xch, domid, HVM_PARAM_VPT_ALIGN, (unsigned long)
info->vpt_align);
xc_domain_max_vcpus(ctx->xch, domid, info->max_vcpus);
- xc_domain_setmaxmem(ctx->xch, domid, info->max_memkb + info->video_memkb);
+ xc_domain_setmaxmem(ctx->xch, domid, info->target_memkb +
LIBXL_MAXMEM_CONSTANT);
xc_domain_set_memmap_limit(ctx->xch, domid,
(info->hvm) ? info->max_memkb :
(info->max_memkb + info->u.pv.slack_memkb));
@@ -81,7 +81,9 @@
ents[0] = "memory/static-max";
ents[1] = libxl_sprintf(ctx, "%d", info->max_memkb);
ents[2] = "memory/target";
- ents[3] = libxl_sprintf(ctx, "%d", info->max_memkb); /* PROBABLY WRONG */
+ ents[3] = libxl_sprintf(ctx, "%d", info->target_memkb);
+ ents[2] = "memory/videoram";
+ ents[3] = libxl_sprintf(ctx, "%d", info->video_memkb);
ents[4] = "domid";
ents[5] = libxl_sprintf(ctx, "%d", domid);
ents[6] = "store/port";
@@ -145,7 +147,7 @@
{
int ret;
- ret = xc_hvm_build(ctx->xch, domid, info->max_memkb / 1024, info->kernel);
+ ret = xc_hvm_build_target_mem(ctx->xch, domid, (info->max_memkb -
info->video_memkb) / 1024, (info->target_memkb - info->video_memkb) / 1024,
info->kernel);
if (ret) {
XL_LOG_ERRNOVAL(ctx, XL_LOG_ERROR, ret, "hvm building failed");
return ERROR_FAIL;
diff -r fe3c8ba27d2f tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Tue Dec 08 17:02:15 2009 +0000
+++ b/tools/libxl/libxl_internal.h Tue Dec 08 17:14:35 2009 +0000
@@ -31,6 +31,7 @@
#define LIBXL_DEVICE_MODEL_START_TIMEOUT 10
#define LIBXL_XENCONSOLE_LIMIT 1048576
#define LIBXL_XENCONSOLE_PROTOCOL "vt100"
+#define LIBXL_MAXMEM_CONSTANT (1 * 1024 * 1024)
#define QEMU_SIGNATURE "QemuDeviceModelRecord"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
diff -r fe3c8ba27d2f tools/libxl/xl.c
--- a/tools/libxl/xl.c Tue Dec 08 17:02:15 2009 +0000
+++ b/tools/libxl/xl.c Tue Dec 08 17:14:35 2009 +0000
@@ -85,6 +85,7 @@
printf("vpt_align: %d\n", b_info->vpt_align);
printf("max_vcpus: %d\n", b_info->max_vcpus);
printf("max_memkb: %d\n", b_info->max_memkb);
+ printf("target_memkb: %d\n", b_info->target_memkb);
printf("kernel: %s\n", b_info->kernel);
printf("hvm: %d\n", b_info->hvm);
@@ -283,8 +284,10 @@
if (config_lookup_int (&config, "vcpus", &l) == CONFIG_TRUE)
b_info->max_vcpus = l;
- if (config_lookup_int (&config, "memory", &l) == CONFIG_TRUE)
+ if (config_lookup_int (&config, "memory", &l) == CONFIG_TRUE) {
b_info->max_memkb = l * 1024;
+ b_info->target_memkb = b_info->max_memkb;
+ }
if (config_lookup_int (&config, "shadow_memory", &l) == CONFIG_TRUE)
b_info->shadow_memkb = l * 1024;
@@ -756,6 +759,7 @@
printf(" restore restore a domain from a saved
state\n\n");
printf(" cd-insert insert a cdrom into a guest's
cd drive\n\n");
printf(" cd-eject eject a cdrom from a guest's cd
drive\n\n");
+ printf(" mem-set set the current memory usage
for a domain\n\n");
} else if(!strcmp(command, "create")) {
printf("Usage: xl create <ConfigFile> [options] [vars]\n\n");
printf("Create a domain based on <ConfigFile>.\n\n");
@@ -804,7 +808,52 @@
} else if (!strcmp(command, "cd-eject")) {
printf("Usage: xl cd-eject <Domain> <VirtualDevice>\n\n");
printf("Eject a cdrom from a guest's cd drive.\n\n");
+ } else if (!strcmp(command, "mem-set")) {
+ printf("Usage: xl mem-set <Domain> <MemKB>\n\n");
+ printf("Set the current memory usage for a domain.\n\n");
}
+}
+
+void set_memory_target(char *p, char *mem)
+{
+ struct libxl_ctx ctx;
+ uint32_t domid;
+
+ libxl_ctx_init(&ctx);
+ libxl_ctx_set_log(&ctx, log_callback, NULL);
+
+ if (libxl_param_to_domid(&ctx, p, &domid) < 0) {
+ fprintf(stderr, "%s is an invalid domain identifier\n", p);
+ exit(2);
+ }
+ libxl_set_memory_target(&ctx, domid, atoi(mem));
+}
+
+int main_memset(int argc, char **argv)
+{
+ int opt = 0;
+ char *p = NULL, *mem;
+
+ while ((opt = getopt(argc, argv, "h:")) != -1) {
+ switch (opt) {
+ case 'h':
+ help("mem-set");
+ exit(0);
+ default:
+ fprintf(stderr, "option not supported\n");
+ break;
+ }
+ }
+ if (optind >= argc - 1) {
+ help("mem-set");
+ exit(2);
+ }
+
+ p = argv[optind];
+ mem = argv[optind + 1];
+
+ set_memory_target(p, mem);
+ exit(0);
}
void console(char *p, int cons_num)
@@ -1436,6 +1485,8 @@
main_cd_insert(argc - 1, argv + 1);
} else if (!strcmp(argv[1], "cd-eject")) {
main_cd_eject(argc - 1, argv + 1);
+ } else if (!strcmp(argv[1], "mem-set")) {
+ main_memset(argc - 1, argv + 1);
} else if (!strcmp(argv[1], "help")) {
if (argc > 2)
help(argv[2]);
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