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Sanitizing kernel memorySanitizing kernel memoryPosted Jun 2, 2009 16:24 UTC (Tue) by anton (guest, #25547)In reply to: Sanitizing kernel memory by etienne_lorrain@yahoo.fr Parent article: Sanitizing kernel memory Yes, if the zeroed cache lines are not accessed or not accessed before being replaced in the cache, then the performance of on-demand zeroing for that cache line will be just as bad as eager zeroing in the cache, and a little worse than for eager methods that don't go through the cache. But I doubt that that's the case for the majority of cache lines. In particular, I don't think that there are replaced at all cache levels before being accessed. But yes, measurements would be a good idea. Concerning eager zeroing of cache lines, that is certain to replace a page full of cache lines just as on-demand zeroing does, except that it is far less likely that the cache lines will be accessed before being replaced by other cache lines, so it is a bad idea. Tagging the line as least-recently-used helps only a little, if it is possible at all.
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