Mark Post wrote:
But that wasn't your comment/question. You asked if my original answer would apply to CMMA, and I said no, it would not apply to CMMA, since that is an architected interface between Linux and z/VM, implying that the drop cache /proc interface is not. And indeed it is not. Using CMM-1 (and possibly CMMA/CMM-2 if you're brave enough) will achieve real storage savings and, unless mis-handled by VMRM or the system administrator, not adversely affect performance of the Linux guest. Using the /proc interface to drop cache and buffers is not recommended in a production environment.
Ok.. Just a communication problem then.. My comment addressed a specific portion of your statement : "Just because linux no longer treats those pages as being used doesn't mean z/VM sees them as free". My (verbatim) comment was : "Does this still hold true when using CMMA ?" This may have been the reason why we had a miscommunication - I wasn't specific enough about what portion of your statement I was referring to. I was making this comment since I was under the impression that CMMA's intent is to allow linux to indicate explicit page disposition to CP. Bah.; anyway.. no big deal ;) --Ivan ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
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