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Subject[PATCH 2/2] log out-of-virtual-memory events (was: [RFC] log out-of-virtual-memory events)
Date
Bernd Eckenfels wrote:
> In article <464DCC52.7090403@users.sourceforge.net> you wrote:
>> + printk(KERN_INFO
>> + "out of virtual memory for process %d (%s): total_vm=%lu, uid=%d\n",
>> + current->pid, current->comm, total_vm, current->uid);
>
> And align this one with the print_fatal layout:
>
> printk(KERN_WARNING
> "%s/%d process cannot request more virtual memory: total_vm=%lu, uid=%d\n",
> current->comm, current->pid, total_vm, current->uid);
>

Depends on print_fatal_signals patch.

---
Print informations about userspace processes that fail to allocate new virtual
memory.

Signed-off-by: Andrea Righi <a.righi@cineca.it>

diff -urpN linux-2.6.22-rc1-mm1/mm/mmap.c linux-2.6.22-rc1-mm1-vm-log-enomem/mm/mmap.c
--- linux-2.6.22-rc1-mm1/mm/mmap.c 2007-05-19 11:25:24.000000000 +0200
+++ linux-2.6.22-rc1-mm1-vm-log-enomem/mm/mmap.c 2007-05-19 11:55:05.000000000 +0200
@@ -77,6 +77,31 @@ int sysctl_overcommit_ratio = 50; /* def
int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
atomic_t vm_committed_space = ATOMIC_INIT(0);

+extern int print_fatal_signals;
+
+/*
+ * Print current process informations when it fails to allocate new virtual
+ * memory.
+ */
+static inline void log_vm_enomem(void)
+{
+ unsigned long total_vm = 0;
+ struct mm_struct *mm;
+
+ if (unlikely(!printk_ratelimit()))
+ return;
+
+ task_lock(current);
+ mm = current->mm;
+ if (mm)
+ total_vm = mm->total_vm;
+ task_unlock(current);
+
+ printk(KERN_WARNING
+ "%s/%d process cannot request more virtual memory: total_vm=%lu, uid=%d\n",
+ current->comm, current->pid, total_vm, current->uid);
+}
+
/*
* Check that a process has enough memory to allocate a new virtual
* mapping. 0 means there is enough memory for the allocation to
@@ -177,6 +202,9 @@ int __vm_enough_memory(long pages, int c
error:
vm_unacct_memory(pages);

+ if (print_fatal_signals)
+ log_vm_enomem();
+
return -ENOMEM;
}
-
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