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Pekka J Enberg wrote: > Hi Nick, > > On Fri, 16 Mar 2007, Nick Piggin wrote: > >>Could you try something like walk the i_mmap lists to find mms with vmas that >>haven't need revoking, then each time you find one, take a ref on the mm, drop >>i_mmap_lock, take mmap_sem, and walk all its vmas looking for any that >>reference the inode? > > > Yes, that would work. What I am cooking up now is dropping > ->i_mmap_lock, restarting the scan after each revoke_vma() and skipping > vmas that are VM_REVOKED. Of course you can't take a reference to a vma, so to pin a vma you need the mmap_sem, and to do that you need to drop i_mmap_lock, which means your vma might go away ;) So I think you really do need to get back to the mm, and then search its vmas. Also, a down_write_trylock attempt inside i_mmap_lock should be a valid optimisation. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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