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From: | Michael R. Hines |
Subject: | [Qemu-devel] [RFC] parallelize migration_bitmap_sync() |
Date: | Thu, 28 Feb 2013 18:22:43 -0500 |
User-agent: | Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 |
Hi,Currently migration_bitmap_sync() is very expensive: on the order of 15-20 milliseconds by my count using timestamps (for a simple 2GB ram virtual machine). Until new EPT processor versions come out in 2014, we need software support for cutting this time down much lower........by at least an order of magnitude.
Would anyone be opposed to me writing a patch that creates N threads and dividing up the migration_bitmap_sync() function to have the dirty page scanning run in parallel?
- Michael
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