* [linux-lvm] heat map @ 2013-06-24 7:04 matthew patton 2013-06-24 19:24 ` Alasdair G Kergon 0 siblings, 1 reply; 2+ messages in thread From: matthew patton @ 2013-06-24 7:04 UTC (permalink / raw) To: linux-lvm If some older man pages are to be believed there once was a capability to keep a heat map of busy extents. Is there a way to revive that capability? I expect "last I/O within 30 seconds, 5 minute, 15minute" is probably sufficient for most uses as well as summary counters along the same lines. ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [linux-lvm] heat map 2013-06-24 7:04 [linux-lvm] heat map matthew patton @ 2013-06-24 19:24 ` Alasdair G Kergon 0 siblings, 0 replies; 2+ messages in thread From: Alasdair G Kergon @ 2013-06-24 19:24 UTC (permalink / raw) To: matthew patton; +Cc: linux-lvm On Mon, Jun 24, 2013 at 12:04:00AM -0700, matthew patton wrote: > If some older man pages are to be believed there once was a capability > to keep a heat map of busy extents. Is there a way to revive that > capability? I expect "last I/O within 30 seconds, 5 minute, 15minute" is > probably sufficient for most uses as well as summary counters along the > same lines. Mikulas is developing a replacement here: http://people.redhat.com/~mpatocka/patches/kernel/dm-statistics/ Documentation appears at the end of the kernel patch. If you want to try it out at the moment, you'll need this patch first I think: http://people.redhat.com/agk/patches/linux/editing/dm-optimize-use-SRCU-and-RCU.patch Alasdair ^ permalink raw reply [flat|nested] 2+ messages in thread
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