Hi Johannes,
On 03/13/2013 12:52 AM, Johannes Weiner wrote:
On Sat, Mar 09, 2013 at 10:00:37AM +0800, Will Huck wrote:
Hi Johannes,
On 03/08/2013 10:35 AM, Johannes Weiner wrote:
On Thu, Mar 07, 2013 at 06:07:23PM -0800, Raymond Jennings wrote:
Just a two cent question, but is there any merit to having the kernel
defragment swap space?
That is a good question.
Swap does fragment quite a bit, and there are several reasons for
that.
Are there any tools to test and monitor swap subsystem and page
reclaim subsystem?
pgscan_kswapd_dma 0
pgscan_kswapd_dma32 0
pgscan_kswapd_normal 0
pgscan_kswapd_movable 0
pgscan_direct_dma 0
pgscan_direct_dma32 0
pgscan_direct_normal 0
pgscan_direct_movable 0
pgscan_direct_throttle 0
zone_reclaim_failed 0
pginodesteal 0
slabs_scanned 328704
slab cache is scaned but file-backed/swap-backed pages are not scanned, why?
seekwatcher is great to see the IO patterns. Anything that uses
anonymous memory can test swap: a java job, multiplying matrixes,
kernel builds etc. I mostly log /proc/vmstat by taking snapshots at a
regular interval during the workload, then plot and visually correlate
the swapin/swapout counters with the individual LRU sizes, page fault
rate, what have you, to get a feeling for what it's doing.
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