From: Paul Jackson <[EMAIL PROTECTED]>
Thanks to Randy Dunlap for the review that caught
some of the following.
Some bug fixes and coding style fixes:
1) only one statement per line, please.
2) don't need to guard kfree() calls with a NULL check
3) use kfifo_free, not kfree, if it came from kfifo_alloc
4) a pair of curly brackets got lost along the way
5) missing .read, .write callbacks for sched_load_balance
Without (3), one kfifo buffer memory was leaked each time
one rebuilt scheduler domains
Without (4), the current task was summarily killed each
time one tried to rebuild scheduler domains
Without (5), every read or write system call on a per-cpuset
special file 'sched_load_balance' failed, EINVAL.
Signed-off-by: Paul Jackson <[EMAIL PROTECTED]>
---
Andrew,
These fixes go right after the patch they fix:
[PATCH] cpuset and sched domains: sched_load_balance flag
kernel/cpuset.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
--- 2.6.23-rc8-mm1.orig/kernel/cpuset.c 2007-10-02 21:29:51.245156939 -0700
+++ 2.6.23-rc8-mm1/kernel/cpuset.c 2007-10-02 21:26:56.000000000 -0700
@@ -579,7 +579,9 @@ static void rebuild_sched_domains(void)
int ndoms; /* number of sched domains in result */
int nslot; /* next empty doms[] cpumask_t slot */
- q = NULL; csa = NULL; doms = NULL;
+ q = NULL;
+ csa = NULL;
+ doms = NULL;
/* Special case for the 99% of systems with one, full, sched domain */
if (is_sched_load_balance(&top_cpuset)) {
@@ -604,9 +606,10 @@ static void rebuild_sched_domains(void)
struct cpuset *child; /* scans child cpusets of cp */
if (is_sched_load_balance(cp))
csa[csn++] = cp;
- list_for_each_entry(cont, &cp->css.cgroup->children, sibling)
+ list_for_each_entry(cont, &cp->css.cgroup->children, sibling) {
child = cgroup_cs(cont);
__kfifo_put(q, (void *)&child, sizeof(cp));
+ }
}
for (i = 0; i < csn; i++)
@@ -668,9 +671,8 @@ rebuild:
done:
if (q && !IS_ERR(q))
- kfree(q);
- if (csa)
- kfree(csa);
+ kfifo_free(q);
+ kfree(csa);
/* Don't kfree(doms) -- partition_sched_domains() does that. */
}
@@ -1358,6 +1360,8 @@ static struct cftype cft_mem_exclusive =
static struct cftype cft_sched_load_balance = {
.name = "sched_load_balance",
+ .read = cpuset_common_file_read,
+ .write = cpuset_common_file_write,
.private = FILE_SCHED_LOAD_BALANCE,
};
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <[EMAIL PROTECTED]> 1.650.933.1373
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