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mm/mempolicy: Limit policy ignored messages #7187

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mm/mempolicy: Limit policy ignored messages #7187

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17 changes: 15 additions & 2 deletions mm/mempolicy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1625,8 +1625,10 @@ SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len,
static long kernel_set_mempolicy(int mode, const unsigned long __user *nmask,
unsigned long maxnode)
{
static struct task_struct *prev_task;
char name[sizeof(current->comm)];
unsigned short mode_flags;
static int task_msgs;
nodemask_t nodes;
int lmode = mode;
int err;
Expand All @@ -1635,8 +1637,19 @@ static long kernel_set_mempolicy(int mode, const unsigned long __user *nmask,

if (mempolicy_cmdline_set) {
// ignore messages during boot which are expected
if (ktime_get_boottime_seconds() > 40)
pr_info("Request by '%s' to set policy to %d ignored\n", get_task_comm(name, current), mode);
if (ktime_get_boottime_seconds() > 40) {
if (!prev_task || prev_task != current) {
task_msgs = 0;
prev_task = current;
}
if (task_msgs < 5) {
const char *task = get_task_comm(name, current);

pr_info("Request by '%s' to set policy to %d ignored\n",
task, mode);
task_msgs++;
}
}
return 0;
}

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