VM questions

From: James Wilson (jwilson@cmu.edu)
Date: Fri May 26 2000 - 11:21:26 EST

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I'm working on a research project that involves some kernel hacking --
this is my experience with the linux kernel. A few questions:

In swapin_readadead (mm/memory.c):

new_page = read_swap_cache_async(SWP_ENTRY(SWP_TYPE(entry), offset), 0);
if (new_page != NULL)
__free_page(new_page);

Seems like we are freeing a page just after allocating/reading it! There
must be a reason for this, can someone supply it?

Also, the swapin hook operation that was used by do_swap_page
(mm/memory.c) seems to have vanished in the 2.3.10 patch. Any reason why
this was done?

Please cc me too, lest it get lost in the traffic

-- James Wilson <jwilson@cmu.edu> School of Computer Science Carnegie Mellon University

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