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Subject[patch 24/38] CKRM e18: Add numtasks controller config file write support
Add numtasks controller config file write support

Signed-Off-By: Matt Helsley <matthltc@us.ibm.com>
Signed-Off-By: Gerrit Huizenga <gh@us.ibm.com>

---------------------------------------------------------------------

Index: linux-2.6.12-ckrm1/kernel/ckrm/ckrm_numtasks.c
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/ckrm_numtasks.c 2005-06-20 15:02:49.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/ckrm_numtasks.c 2005-06-20 15:04:50.000000000 -0700
@@ -22,11 +22,17 @@
#include <asm/div64.h>
#include <linux/list.h>
#include <linux/spinlock.h>
+#include <linux/parser.h>
#include <linux/ckrm_rc.h>
#include <linux/ckrm_tc.h>
#include <linux/ckrm_tsk.h>

-#define TOTAL_NUM_TASKS (131072) /* 128 K */
+#define DEF_TOTAL_NUM_TASKS (131072) /* 128 K */
+static int total_numtasks = DEF_TOTAL_NUM_TASKS;
+static int total_cnt_alloc = 0;
+
+#define SYS_TOTAL_TASKS "sys_total_tasks"
+
#define NUMTASKS_DEBUG
#define NUMTASKS_NAME "numtasks"

@@ -94,6 +100,9 @@ static void numtasks_res_initcls_one(str
res->tot_borrow_sucesses = 0;
res->tot_borrow_failures = 0;

+ res->forks_in_period = 0;
+ res->period_start = jiffies;
+
atomic_set(&res->cnt_cur_alloc, 0);
atomic_set(&res->cnt_borrowed, 0);
return;
@@ -101,7 +110,7 @@ static void numtasks_res_initcls_one(str

static int numtasks_get_ref_local(struct ckrm_core_class *core, int force)
{
- int rc, resid = numtasks_rcbs.resid;
+ int rc, resid = numtasks_rcbs.resid, borrowed = 0;
struct ckrm_numtasks *res;

if ((resid < 0) || (core == NULL))
@@ -111,6 +120,27 @@ static int numtasks_get_ref_local(struct
if (res == NULL)
return 1;

+ /*
+ * force is not associated with fork. So, if force is specified
+ * we don't have to bother about forkrate.
+ */
+ if (!force) {
+ /* Take care of wraparound situation */
+ chg_at = res->period_start + forkrate_interval * HZ;
+ if (chg_at < res->period_start) {
+ chg_at += forkrate_interval * HZ;
+ now += forkrate_interval * HZ;
+ }
+ if (chg_at <= now) {
+ res->period_start = now;
+ res->forks_in_period = 0;
+ }
+
+ if (res->forks_in_period >= forkrate) {
+ return 0;
+ }
+ }
+
atomic_inc(&res->cnt_cur_alloc);

rc = 1;
@@ -129,6 +159,7 @@ static int numtasks_get_ref_local(struct
res->borrow_sucesses++;
res->tot_borrow_sucesses++;
res->over_guarantee = 1;
+ borrowed++;
} else {
res->borrow_failures++;
res->tot_borrow_failures++;
@@ -151,6 +182,8 @@ static int numtasks_get_ref_local(struct

if (!rc)
atomic_dec(&res->cnt_cur_alloc);
+ else if (!borrowed)
+ total_cnt_alloc++;
return rc;
}

@@ -172,7 +205,10 @@ static void numtasks_put_ref_local(struc
if (atomic_read(&res->cnt_borrowed) > 0) {
atomic_dec(&res->cnt_borrowed);
numtasks_put_ref_local(res->parent);
+ } else {
+ total_cnt_alloc--;
}
+
return;
}

@@ -194,9 +230,9 @@ static void *numtasks_res_alloc(struct c
* I am part of root class. So set the max tasks
* to available default.
*/
- res->cnt_guarantee = TOTAL_NUM_TASKS;
- res->cnt_unused = TOTAL_NUM_TASKS;
- res->cnt_limit = TOTAL_NUM_TASKS;
+ res->cnt_guarantee = total_numtasks;
+ res->cnt_unused = total_numtasks;
+ res->cnt_limit = total_numtasks;
}
try_module_get(THIS_MODULE);
} else {
@@ -336,15 +372,7 @@ static int numtasks_set_share_values(voi

if ((rc == 0) && parres) {
/* Calculate parent's unused units */
- if (parres->cnt_guarantee == CKRM_SHARE_DONTCARE)
- parres->cnt_unused = CKRM_SHARE_DONTCARE;
- else if (par->total_guarantee) {
- u64 temp = (u64) par->unused_guarantee * parres->cnt_guarantee;
- do_div(temp, par->total_guarantee);
- parres->cnt_unused = (int) temp;
- } else
- parres->cnt_unused = 0;
- recalc_and_propagate(res, parres);
+ recalc_and_propagate(parres, NULL);
}
spin_unlock(&res->cnt_lock);
if (res->parent)
@@ -404,18 +432,57 @@ static int numtasks_show_config(void *my

if (!res)
return -EINVAL;
-
- seq_printf(sfile, "res=%s,parameter=somevalue\n", NUMTASKS_NAME);
+ seq_printf(sfile, "res=%s,%s=%d\n", NUMTASKS_NAME,
+ SYS_TOTAL_TASKS, total_numtasks);
return 0;
}

+enum numtasks_token_t {
+ numtasks_token_total,
+ numtasks_token_err
+};
+
+static match_table_t numtasks_tokens = {
+ {numtasks_token_total, SYS_TOTAL_TASKS "=%d"},
+ {numtasks_token_err, NULL},
+};
+
static int numtasks_set_config(void *my_res, const char *cfgstr)
{
+ char *p;
struct ckrm_numtasks *res = my_res;
+ int new_total = 0;

if (!res)
return -EINVAL;
- printk("numtasks config='%s'\n", cfgstr);
+ while ((p = strsep(&cfgstr, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, numtasks_tokens, args);
+ switch (token) {
+ case numtasks_token_total:
+ if (match_int(args, &new_total))
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ if (new_total < total_cnt_alloc)
+ return -EINVAL;
+ total_numtasks = new_total;
+
+ /* res if the default class, as config is present only in
+ that directory */
+ spin_lock(&res->cnt_lock);
+ res->cnt_guarantee = total_numtasks;
+ res->cnt_unused = total_numtasks;
+ res->cnt_limit = total_numtasks;
+ recalc_and_propagate(res, NULL);
+ spin_unlock(&res->cnt_lock);
return 0;
}

--
-
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