On Wed, Apr 14, 2010 at 10:18 AM, Manish Katiyar <mkati...@gmail.com> wrote: > On Wed, Apr 14, 2010 at 8:04 PM, Vikash Kumar <vikashsku...@gmail.com> wrote: >> Hi everyone, >> >> I am writing a simple memory manager for my application which will >> free any excess memory being used by my modules, so that it's >> available again for use. My modules allocate memory using alloc_page & >> kmem_cache_alloc and so the memory manager uses put_page & >> kmem_cache_free respectively to free up the memory which is not in >> use. >> >> The problem I am facing is, even after I free the memory using >> put_page & kmem_cache_free, my modules are not able to get the free >> memory. I have written a test code which allocates a lot of memory in >> loop and when out of memory sleeps on memory manager to free up the >> memory. Memory manager successfully executes free code and wakes up >> the sleeping process as memory should be available now. Interestingly >> the alloc_page / kmem_cache_alloc calls still fail to allocate >> memory. Now, I am clueless why it is happening so seeking help. > > Random guess... Are you sure it is still free between your free and > allocate. ie.. no one else comes in between takes away your memory ? > > Thanks - > Manish > >
Slab allocator does not just free the pages when u call kmem_cache_free. It has a list of empty, partial and full slabs. So if yo free it will just be in free list. have you called kmem_cache_destroy to destroy the whole cache? correct me if i am wrong here. --------------------------------------------------------------- regards Manish Regmi http://manish-cs.blogspot.com http://ext2read.sf.net -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
