flushing tlb in try_to_swap_out

flushing tlb in try_to_swap_out

[Raghu R. Arur]

   I see that in try_to_swap_out() (linux 2.4.19), the page that is being
unmapped from a process is flushed out. But try_to_swap_out() is executed
in the context of kswapd. And also whenever a context switch takes place
the whole tlb is flushed out. So is this flushing done just becuase linux
uses lazy_tlb_flush during process context switch ?

 thanks a lot,
 Raghu
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Re: flushing tlb in try_to_swap_out

[Rik van Riel]

On Mon, 1 Sep 2003, Raghu R. Arur wrote:

>    I see that in try_to_swap_out() (linux 2.4.19), the page that is being
> unmapped from a process is flushed out. But try_to_swap_out() is executed
> in the context of kswapd. And also whenever a context switch takes place
> the whole tlb is flushed out. So is this flushing done just becuase linux
> uses lazy_tlb_flush during process context switch ?

Think about SMP systems, where the task that's being swapped
out could be running simultaneously with the pageout code, on
another CPU.

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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