@@ -184,6 +184,10 @@ A directory of all current cpupools.
The individual cpupools. Each entry is a directory with the name being the
cpupool-id (e.g. /cpupool/0/).
+#### /cpupool/*/sched-gran = ("cpu" | "core" | "socket")
+
+The scheduling granularity of a cpupool.
+
#### /params/
A directory of runtime parameters.
@@ -41,9 +41,10 @@ static DEFINE_SPINLOCK(cpupool_lock);
static enum sched_gran __read_mostly opt_sched_granularity = SCHED_GRAN_cpu;
static unsigned int __read_mostly sched_granularity = 1;
+#define SCHED_GRAN_NAME_LEN 8
struct sched_gran_name {
enum sched_gran mode;
- char name[8];
+ char name[SCHED_GRAN_NAME_LEN];
};
static const struct sched_gran_name sg_name[] = {
@@ -52,7 +53,7 @@ static const struct sched_gran_name sg_name[] = {
{SCHED_GRAN_socket, "socket"},
};
-static void sched_gran_print(enum sched_gran mode, unsigned int gran)
+static const char *sched_gran_get_name(enum sched_gran mode)
{
const char *name = "";
unsigned int i;
@@ -66,8 +67,13 @@ static void sched_gran_print(enum sched_gran mode, unsigned int gran)
}
}
+ return name;
+}
+
+static void sched_gran_print(enum sched_gran mode, unsigned int gran)
+{
printk("Scheduling granularity: %s, %u CPU%s per sched-resource\n",
- name, gran, gran == 1 ? "" : "s");
+ sched_gran_get_name(mode), gran, gran == 1 ? "" : "s");
}
#ifdef CONFIG_HAS_SCHED_GRANULARITY
@@ -1033,9 +1039,14 @@ static int cpupool_dir_read(const struct hypfs_entry *entry,
int ret = 0;
const struct cpupool *c;
unsigned int size = 0;
+ struct hypfs_dyndir_id *data;
+
+ data = hypfs_get_dyndata();
list_for_each_entry(c, &cpupool_list, list)
{
+ data->id = c->cpupool_id;
+
size += hypfs_dynid_entry_size(entry, c->cpupool_id);
ret = hypfs_read_dyndir_id_entry(&cpupool_pooldir, c->cpupool_id,
@@ -1100,6 +1111,56 @@ static struct hypfs_entry *cpupool_dir_findentry(
return hypfs_gen_dyndir_entry_id(&cpupool_pooldir, id);
}
+static int cpupool_gran_read(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ const struct hypfs_dyndir_id *data;
+ const struct cpupool *cpupool;
+ const char *gran;
+
+ data = hypfs_get_dyndata();
+ cpupool = __cpupool_find_by_id(data->id, true);
+ ASSERT(cpupool);
+
+ gran = sched_gran_get_name(cpupool->gran);
+
+ if ( !*gran )
+ return -ENOENT;
+
+ return copy_to_guest(uaddr, gran, strlen(gran) + 1) ? -EFAULT : 0;
+}
+
+static unsigned int hypfs_gran_getsize(const struct hypfs_entry *entry)
+{
+ const struct hypfs_dyndir_id *data;
+ const struct cpupool *cpupool;
+ const char *gran;
+
+ data = hypfs_get_dyndata();
+ cpupool = __cpupool_find_by_id(data->id, true);
+ ASSERT(cpupool);
+
+ gran = sched_gran_get_name(cpupool->gran);
+
+ return strlen(gran) + 1;
+}
+
+static struct hypfs_funcs cpupool_gran_funcs = {
+ .enter = hypfs_node_enter,
+ .exit = hypfs_node_exit,
+ .read = cpupool_gran_read,
+ .write = hypfs_write_deny,
+ .getsize = hypfs_gran_getsize,
+ .findentry = hypfs_leaf_findentry,
+};
+
+static HYPFS_VARSIZE_INIT(cpupool_gran, XEN_HYPFS_TYPE_STRING, "sched-gran",
+ 0, &cpupool_gran_funcs);
+static char granstr[SCHED_GRAN_NAME_LEN] = {
+ [0 ... SCHED_GRAN_NAME_LEN - 2] = '?',
+ [SCHED_GRAN_NAME_LEN - 1] = 0
+};
+
static struct hypfs_funcs cpupool_dir_funcs = {
.enter = cpupool_dir_enter,
.exit = cpupool_dir_exit,
@@ -1115,6 +1176,8 @@ static void cpupool_hypfs_init(void)
{
hypfs_add_dir(&hypfs_root, &cpupool_dir, true);
hypfs_add_dyndir(&cpupool_dir, &cpupool_pooldir);
+ hypfs_string_set_reference(&cpupool_gran, granstr);
+ hypfs_add_leaf(&cpupool_pooldir, &cpupool_gran, true);
}
#else
Add a "sched-gran" entry to the per-cpupool hypfs directories. For now make this entry read-only and let it contain one of the strings "cpu", "core" or "socket". Signed-off-by: Juergen Gross <jgross@suse.com> --- V2: - added const (Jan Beulich) - modify test in cpupool_gran_read() (Jan Beulich) --- docs/misc/hypfs-paths.pandoc | 4 +++ xen/common/sched/cpupool.c | 69 ++++++++++++++++++++++++++++++++++-- 2 files changed, 70 insertions(+), 3 deletions(-)