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From: Jose Luis Marchetti on 11 May 2010 01:00
Hi,

It appears that doing down_read(&mm->mmap_sem) is enough to safely use vma->vm_file, is it correct ?

Also in the lock subject, to get to all vm_files in the system, is the following correct or something is missing ?

read_lock(&tasklist_lock);
for_each_process(p)
{
mm = get_task_mm(p);
down_read(&mm->mmap_sem);

// ... Here what I need to do with this mm vm_file objects

up_read(&mm->mmap_sem);
mmput(mm);
}
read_unlock(&tasklist_lock);

Thanks in advance for your answer
Jos� Lu�s Marchetti



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Prev: [PATCH -tip] perf probe: Check older elfutils and set NO_DWARF
Next: [PROPOSAL] NMI & register handling infrastructure