4/6: numtasks_config
Use module parameters to dynamically set the total numtasks and maximum
forkrate allowed
--
Signed-Off-By: Chandra Seetharaman <[email protected]>
Signed-Off-By: Matt Helsley <[email protected]>
include/linux/moduleparam.h | 12 ++++++--
kernel/res_group/numtasks.c | 64 +++++++++++++++++++++++++++++++++++++++++---
2 files changed, 70 insertions(+), 6 deletions(-)
Index: linux-2617-rc3/include/linux/moduleparam.h
===================================================================
--- linux-2617-rc3.orig/include/linux/moduleparam.h 2006-04-27 10:14:36.000000000 -0700
+++ linux-2617-rc3/include/linux/moduleparam.h 2006-04-27 10:18:50.000000000 -0700
@@ -75,11 +75,17 @@ struct kparam_array
/* Helper functions: type is byte, short, ushort, int, uint, long,
ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
param_set_XXX and param_check_XXX. */
-#define module_param_named(name, value, type, perm) \
- param_check_##type(name, &(value)); \
- module_param_call(name, param_set_##type, param_get_##type, &value, perm); \
+#define module_param_named_call(name, value, type, set, perm) \
+ param_check_##type(name, &(value)); \
+ module_param_call(name, set, param_get_##type, &(value), perm); \
__MODULE_PARM_TYPE(name, #type)
+#define module_param_named(name, value, type, perm) \
+ module_param_named_call(name, value, type, param_set_##type, perm)
+
+#define module_param_set_call(name, type, setfn, perm) \
+ module_param_named_call(name, name, type, setfn, perm)
+
#define module_param(name, type, perm) \
module_param_named(name, name, type, perm)
Index: linux-2617-rc3/kernel/res_group/numtasks.c
===================================================================
--- linux-2617-rc3.orig/kernel/res_group/numtasks.c 2006-04-27 10:18:50.000000000 -0700
+++ linux-2617-rc3/kernel/res_group/numtasks.c 2006-04-27 10:18:50.000000000 -0700
@@ -20,6 +20,13 @@
static const char res_ctlr_name[] = "numtasks";
+#define UNLIMITED INT_MAX
+#define DEF_TOTAL_NUM_TASKS UNLIMITED
+static int total_numtasks __read_mostly = DEF_TOTAL_NUM_TASKS;
+
+static struct resource_group *root_rgroup;
+static int total_cnt_alloc = 0;
+
struct numtasks {
struct resource_group *rgroup;/* resource group i am part of... */
struct res_shares shares;
@@ -81,6 +88,7 @@ static void inc_usage_count(struct numta
atomic_inc(&res->cnt_cur_alloc);
if (is_res_group_root(res->rgroup)) {
+ total_cnt_alloc++;
res->successes++;
return;
}
@@ -89,8 +97,10 @@ static void inc_usage_count(struct numta
(atomic_read(&res->cnt_cur_alloc) > res->cnt_unused)) {
inc_usage_count(get_numtasks(res->rgroup->parent));
atomic_inc(&res->cnt_borrowed);
- } else
- res->successes++;
+ } else {
+ total_cnt_alloc++;
+ res->successes++;
+ }
}
static void dec_usage_count(struct numtasks *res)
@@ -101,7 +111,9 @@ static void dec_usage_count(struct numta
if (atomic_read(&res->cnt_borrowed) > 0) {
atomic_dec(&res->cnt_borrowed);
dec_usage_count(get_numtasks(res->rgroup->parent));
- }
+ } else
+ total_cnt_alloc--;
+
}
static void numtasks_move_task(struct task_struct *task,
@@ -146,6 +158,8 @@ static struct res_shares *numtasks_alloc
return NULL;
res->rgroup = rgroup;
numtasks_res_init_one(res);
+ if (is_res_group_root(rgroup))
+ root_rgroup = rgroup; /* store root's resource group. */
return &res->shares;
}
@@ -307,6 +321,50 @@ struct res_controller numtasks_ctlr = {
.show_stats = numtasks_show_stats,
};
+/*
+ * Writeable module parameters use these set_<parameter> functions to respond
+ * to changes. Otherwise the values can be read and used any time.
+ */
+static int set_numtasks_config_val(int *var, int old_value, const char *val,
+ struct kernel_param *kp)
+{
+ int rc = param_set_int(val, kp);
+
+ if (rc < 0)
+ return rc;
+ if (*var < 1) {
+ *var = old_value;
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int set_total_numtasks(const char *val, struct kernel_param *kp)
+{
+ int prev = total_numtasks;
+ int rc = set_numtasks_config_val(&total_numtasks, prev, val, kp);
+ struct numtasks *res = NULL;
+
+ if (!root_rgroup)
+ return 0;
+ if (rc < 0)
+ return rc;
+ if (total_numtasks <= total_cnt_alloc) {
+ total_numtasks = prev;
+ return -EINVAL;
+ }
+ res = get_numtasks(root_rgroup);
+ spin_lock(&root_rgroup->group_lock);
+ res->cnt_min_shares = total_numtasks;
+ res->cnt_unused = total_numtasks;
+ res->cnt_max_shares = total_numtasks;
+ recalc_and_propagate(res, NULL);
+ spin_unlock(&root_rgroup->group_lock);
+ return 0;
+}
+module_param_set_call(total_numtasks, int, set_total_numtasks,
+ S_IRUGO | S_IWUSR);
+
int __init init_numtasks_res(void)
{
if (numtasks_ctlr.ctlr_id != NO_RES_ID)
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- [email protected] | .......you may get it.
----------------------------------------------------------------------
-
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