[linux-mm-cc] Re: Announce: Compressed cache alpha-007 (kernel
nitingupta.mail at gmail.com
Wed Sep 20 10:25:33 EDT 2006
Nitin Gupta wrote:
> Peter Zijlstra wrote:
>> On Wed, 2006-09-20 at 18:23 +0530, Nitin Gupta wrote:
>>>> Don't like the bit_spin_trylock/bit_spin_unlock in handle_ccache_fault;
>>>> what's wrong with TestSetPageLocked() and unlock_page() ?
>>> If (PageCompressed(page)) is true then 'page' is 'struct chunk_head'
>>> not 'struct page' and you cannot use unlock_page() on chunk_head.
> But then how will you do equivalent of wait_on_chunk_head() ?
Please ignore above strange reply.
bit_spin_trylock() -> TestSetPageLocked()
bit_spin_unlock() -> ClearPageLocked()
didn't seem correct to me. Like, isn't smb_mb_etc..() done by
bit_spin_unlock() required on SMP?
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