Hello, experts
I have a question about syscall "madvise"
(http://docs.sun.com/app/docs/doc/816-5168/madvise-3c?a=view). I want to know
whether MADV_WILLNEED and MADV_DONTNEED will affect pageout decisions. In my
intuition, page scanner should try to keep MADV_WILLNEED pages in physical
memory, and prefer MADV_DONTNEED pages for swapping out.
In common/os/Vm_pageout.c, there is a piece of comment in checkpage (by
grepping "advise"):
/*
* Checking of rss or madvise flags needed here...
*
* If not "well-behaved", fall through into the code
* for not referenced.
*/
The code after this comment is simply a "hat_clrref(pp);" call. Does this
indicate the advises provided by "madvise()" is not currently taken account
during paging out?
Thanks!
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