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    Subject[RFC] log out-of-virtual-memory events
    Date
    I'm looking for a way to keep track of the processes that fail to allocate new
    virtual memory. What do you think about the following approach (untested)?

    --

    Print informations about the processes that fail to allocate virtual memory.

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

    diff -urpN linux-2.6.21/mm/mmap.c linux-2.6.21-vm-log-enomem/mm/mmap.c
    --- linux-2.6.21/mm/mmap.c 2007-04-26 05:08:32.000000000 +0200
    +++ linux-2.6.21-vm-log-enomem/mm/mmap.c 2007-05-17 18:05:39.000000000 +0200
    @@ -77,6 +77,26 @@ int sysctl_max_map_count __read_mostly =
    atomic_t vm_committed_space = ATOMIC_INIT(0);

    /*
    + * 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;
    +
    + task_lock(current);
    + mm = current->mm;
    + if (mm)
    + total_vm = mm->total_vm;
    + task_unlock(current);
    +
    + 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);
    +}
    +
    +/*
    * Check that a process has enough memory to allocate a new virtual
    * mapping. 0 means there is enough memory for the allocation to
    * succeed and -ENOMEM implies there is not.
    @@ -175,6 +195,7 @@ int __vm_enough_memory(long pages, int c
    return 0;
    error:
    vm_unacct_memory(pages);
    + log_vm_enomem();

    return -ENOMEM;
    }
    -
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