Stupid me. n on both sides of the comparison. Tried to run your script
here but I cannot trigger it.
Next attempt: Sorry for the churn.
SLUB: Fix behavior if the text output of list_locations overflows PAGE_SIZE
If slabs are allocated or freed from a large set of call sites (typical
for the kmalloc area) then we may create more output than fits into
a single PAGE and sysfs only gives us one page. The output should be
truncated. This patch fixes the checks to do the truncation properly.
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Index: linux-2.6.22-rc4-mm2/mm/slub.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/mm/slub.c 2007-06-18 12:13:48.000000000 -0700
+++ linux-2.6.22-rc4-mm2/mm/slub.c 2007-06-18 12:15:10.000000000 -0700
@@ -3649,13 +3649,15 @@ static int list_locations(struct kmem_ca
n += sprintf(buf + n, " pid=%ld",
l->min_pid);
- if (num_online_cpus() > 1 && !cpus_empty(l->cpus)) {
+ if (num_online_cpus() > 1 && !cpus_empty(l->cpus) &&
+ n < PAGE_SIZE - 60) {
n += sprintf(buf + n, " cpus=");
n += cpulist_scnprintf(buf + n, PAGE_SIZE - n - 50,
l->cpus);
}
- if (num_online_nodes() > 1 && !nodes_empty(l->nodes)) {
+ if (num_online_nodes() > 1 && !nodes_empty(l->nodes) &&
+ n < PAGE_SIZE - 60) {
n += sprintf(buf + n, " nodes=");
n += nodelist_scnprintf(buf + n, PAGE_SIZE - n - 50,
l->nodes);
-
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