Nick Piggin wrote: > On Friday 30 November 2007 01:43, Balbir Singh wrote: >> They say better strike when the iron is hot. >> >> Since we have so many people discussing the memory controller, I would >> like to access the readiness of the memory controller for mainline >> merge. Given that we have some time until the merge window, I'd like to >> set aside some time (from my other work items) to work on the memory >> controller, fix review comments and defects. >> >> In the past, we've received several useful comments from Rik Van Riel, >> Lee Schermerhorn, Peter Zijlstra, Hugh Dickins, Nick Piggin, Paul Menage >> and code contributions and bug fixes from Hugh Dickins, Pavel Emelianov, >> Lee Schermerhorn, YAMAMOTO-San, Andrew Morton and KAMEZAWA-San. I >> apologize if I missed out any other names or contributions >> >> At the VM-Summit we decided to try the current double LRU approach for >> memory control. At this juncture in the space-time continuum, I seek >> your support, feedback, comments and help to move the memory controller > > Do you have any test cases, performance numbers, etc.? And also some > results or even anecdotes of where this is going to be used would be > interesting... >
Some test results were posted at http://lkml.org/lkml/2007/8/17/69 http://lkml.org/lkml/2007/8/19/36 http://lwn.net/Articles/242554/ Some results for the RSS controller can be found in the OLS paper https://ols2006.108.redhat.com/2007/Reprints/singh-Reprint.pdf and at http://lkml.org/lkml/2007/5/18/1 As far as test cases are concerned, I have a simple test case that I use that allocates memory and touches all the allocated memory in a loop. I can post that out if required. It uses various types of allocation 1. mmaped memory 2. anonymous memory 3. shared memory I also run various benchmarks inside a control group, limited to 400 MB of RAM. One interesting that I noticed was that when I booted with mem=<some memory> and created a container with the same <some value>. The swapout test case ran much faster in the container (NOTE: This was prior to the swap cache changes). KAMEZAWA-San posted some test results on background reclaim and per zone reclaim http://forum.openvz.org/index.php?t=tree&th=4696&mid=23964&&rev=&reveal= The simplest use cases that come to mind are 1. Memory control for containers/virtualization 2. Job Isolation -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
