Date: Tue, 17 Apr 2007 22:29:52 -0400 From: Rik van Riel <riel@xxxxxxxxxxx> Subject: Re: Tracing page cache Seongsu Lee wrote: > I want to trace page cache. OK > The list of unique pages in cache at each moment is needed. No, that's not needed. You can reconstruct that afterwards from the trace.
Rik, do you mean accessing the mem_map array and then reconstructing a list of unique pages ? Thanks ~psr
> Could you tell me some starting points of this work? > > By tools? > Or by looking and modifying LRU related codes in kernel? If you want to do the second, look at the functions in mm/filemap.c that add pages to the LRU list and remove pages from the LRU list. You can instrument those functions, and maybe the ones in mm/vmscan.c and maybe some other files, to get a trace of exactly what gets added to the page cache and what gets removed. Using this trace you can build up a history of what was in the page cache at which point. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic.
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