libxl_get_free_memory_slack: calculate the amount of memory that should
be left free in the system and write it on xenstore.
libxl_domain_need_memory: calculate how much memory a domain needs in
order to be built and start correctly.
libxl_get_free_memory: calculate the total free memory in the system.
libxl_wait_for_free_memory: wait for a certain amount of memory to
become free in the system.
libxl_wait_for_memory_target: wait for a domain to reach its memory
target.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
diff -r d3596b6319e8 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Wed Sep 01 13:07:32 2010 +0100
+++ b/tools/libxl/libxl.c Wed Sep 01 13:08:02 2010 +0100
@@ -2724,9 +2724,11 @@ static int libxl__fill_dom0_memory_info(
{
int rc;
xc_domaininfo_t info;
+ libxl_physinfo physinfo;
char *target = NULL, *endptr = NULL;
char *target_path = "/local/domain/0/memory/target";
char *max_path = "/local/domain/0/memory/static-max";
+ char *free_mem_slack_path = "/local/domain/0/memory/freemem-slack";
xs_transaction_t t;
libxl_ctx *ctx = libxl_gc_owner(gc);
@@ -2750,10 +2752,16 @@ retry_transaction:
if (rc < 0)
return rc;
+ rc = libxl_get_physinfo(ctx, &physinfo);
+ if (rc < 0)
+ return rc;
+
libxl_xs_write(gc, t, target_path, "%"PRIu32,
(uint32_t) PAGE_TO_MEMKB(info.tot_pages));
libxl_xs_write(gc, t, max_path, "%"PRIu32,
(uint32_t) PAGE_TO_MEMKB(info.max_pages));
+ libxl_xs_write(gc, t, free_mem_slack_path, "%"PRIu32,
+ (uint32_t) PAGE_TO_MEMKB(physinfo.total_pages - info.tot_pages));
*target_memkb = (uint32_t) PAGE_TO_MEMKB(info.tot_pages);
rc = 0;
@@ -2767,6 +2775,33 @@ out:
return rc;
}
+/* returns how much memory should be left free in the system */
+static int libxl__get_free_memory_slack(libxl_gc *gc, uint32_t *free_mem_slack)
+{
+ int rc;
+ char *free_mem_slack_path = "/local/domain/0/memory/freemem-slack";
+ char *free_mem_slack_s, *endptr;
+ uint32_t target_memkb;
+
+retry:
+ free_mem_slack_s = libxl_xs_read(gc, XBT_NULL, free_mem_slack_path);
+ if (!free_mem_slack_s) {
+ rc = libxl__fill_dom0_memory_info(gc, &target_memkb);
+ if (rc < 0)
+ return rc;
+ goto retry;
+ } else {
+ *free_mem_slack = strtoul(free_mem_slack_s, &endptr, 10);
+ if (*endptr != '\0') {
+ XL_LOG_ERRNO(gc->owner, XL_LOG_ERROR,
+ "invalid free_mem_slack %s from %s\n",
+ free_mem_slack_s, free_mem_slack_path);
+ return ERROR_FAIL;
+ }
+ }
+ return 0;
+}
+
int libxl_set_memory_target(libxl_ctx *ctx, uint32_t domid,
uint32_t target_memkb)
{
@@ -2990,6 +3025,102 @@ out:
return rc;
}
+int libxl_domain_need_memory(libxl_ctx *ctx, libxl_domain_build_info *b_info,
+ libxl_device_model_info *dm_info, uint32_t *need_memkb)
+{
+ *need_memkb = b_info->target_memkb;
+ if (b_info->hvm) {
+ *need_memkb += b_info->shadow_memkb + LIBXL_HVM_EXTRA_MEMORY;
+ if (strstr(dm_info->device_model, "stubdom-dm"))
+ *need_memkb += 32 * 1024;
+ } else
+ *need_memkb += LIBXL_PV_EXTRA_MEMORY;
+ if (*need_memkb % (2 * 1024))
+ *need_memkb += (2 * 1024) - (*need_memkb % (2 * 1024));
+ return 0;
+}
+
+int libxl_get_free_memory(libxl_ctx *ctx, uint32_t *memkb)
+{
+ int rc = 0;
+ libxl_physinfo info;
+ uint32_t freemem_slack;
+ libxl_gc gc = LIBXL_INIT_GC(ctx);
+
+ rc = libxl_get_physinfo(ctx, &info);
+ if (rc < 0)
+ goto out;
+ rc = libxl__get_free_memory_slack(&gc, &freemem_slack);
+ if (rc < 0)
+ goto out;
+
+ if ((info.free_pages + info.scrub_pages) * 4 > freemem_slack)
+ *memkb = (info.free_pages + info.scrub_pages) * 4 - freemem_slack;
+ else
+ *memkb = 0;
+
+out:
+ libxl_free_all(&gc);
+ return rc;
+}
+
+int libxl_wait_for_free_memory(libxl_ctx *ctx, uint32_t domid, uint32_t
+ memory_kb, int wait_secs)
+{
+ int rc = 0;
+ libxl_physinfo info;
+ uint32_t freemem_slack;
+ libxl_gc gc = LIBXL_INIT_GC(ctx);
+
+ rc = libxl__get_free_memory_slack(&gc, &freemem_slack);
+ if (rc < 0)
+ goto out;
+ while (wait_secs > 0) {
+ rc = libxl_get_physinfo(ctx, &info);
+ if (rc < 0)
+ goto out;
+ if (info.free_pages * 4 - freemem_slack >= memory_kb) {
+ rc = 0;
+ goto out;
+ }
+ wait_secs--;
+ sleep(1);
+ }
+ rc = ERROR_NOMEM;
+
+out:
+ libxl_free_all(&gc);
+ return rc;
+}
+
+int libxl_wait_for_memory_target(libxl_ctx *ctx, uint32_t domid, int wait_secs)
+{
+ int rc = 0;
+ uint32_t target_memkb = 0;
+ libxl_dominfo info;
+
+ do {
+ wait_secs--;
+ sleep(1);
+
+ rc = libxl_get_memory_target(ctx, domid, &target_memkb);
+ if (rc < 0)
+ goto out;
+
+ rc = libxl_domain_info(ctx, &info, domid);
+ if (rc < 0)
+ return rc;
+ } while (wait_secs > 0 && info.current_memkb > target_memkb);
+
+ if (info.current_memkb <= target_memkb)
+ rc = 0;
+ else
+ rc = ERROR_FAIL;
+
+out:
+ return 0;
+}
+
int libxl_button_press(libxl_ctx *ctx, uint32_t domid, libxl_button button)
{
int rc = -1;
diff -r d3596b6319e8 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Wed Sep 01 13:07:32 2010 +0100
+++ b/tools/libxl/libxl.h Wed Sep 01 13:08:02 2010 +0100
@@ -323,6 +323,15 @@ int libxl_domain_core_dump(libxl_ctx *ct
int libxl_set_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
target_memkb);
int libxl_set_relative_memory_target(libxl_ctx *ctx, uint32_t domid, int32_t
relative_target_memkb);
int libxl_get_memory_target(libxl_ctx *ctx, uint32_t domid, uint32_t
*out_target);
+/* how much free memory in the system a domain needs to be built */
+int libxl_domain_need_memory(libxl_ctx *ctx, libxl_domain_build_info *b_info,
+ libxl_device_model_info *dm_info, uint32_t *need_memkb);
+/* how much free memory is available in the system */
+int libxl_get_free_memory(libxl_ctx *ctx, uint32_t *memkb);
+/* wait for a given amount of memory to be free in the system */
+int libxl_wait_for_free_memory(libxl_ctx *ctx, uint32_t domid, uint32_t
memory_kb, int wait_secs);
+/* wait for the memory target of a domain to be reached */
+int libxl_wait_for_memory_target(libxl_ctx *ctx, uint32_t domid, int
wait_secs);
int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid, int autopass);
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
libxl_console_constype type);
diff -r d3596b6319e8 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Wed Sep 01 13:07:32 2010 +0100
+++ b/tools/libxl/libxl_internal.h Wed Sep 01 13:08:02 2010 +0100
@@ -41,6 +41,8 @@
#define LIBXL_XENCONSOLE_LIMIT 1048576
#define LIBXL_XENCONSOLE_PROTOCOL "vt100"
#define LIBXL_MAXMEM_CONSTANT 1024
+#define LIBXL_PV_EXTRA_MEMORY 1024
+#define LIBXL_HVM_EXTRA_MEMORY 2048
#define QEMU_SIGNATURE "QemuDeviceModelRecord"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
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