Messages in this thread | | | Subject | Re: DAMON: problems when running DAMON on ARM64 with 'transparent_hugepage' enabled | From | Xiongfeng Wang <> | Date | Wed, 27 Oct 2021 14:14:57 +0800 |
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Sorry, I forgot to Cc the maillist. Cc it in this mail.
On 2021/10/27 10:19, Xiongfeng Wang wrote: > Hi SeongJae, > > Sorry to disturb you. It's just that I came across some problems when running > DAMON, but still didn't find the solution after several days. > > A short description is that the result of DAMON is not as expected when running > on ARM64 with 'transparent_hugepage' enabled. But the result is correct when > 'transparent_hugepage' is disabled. > > The following are the steps I came across the problems. > 1. Firstly, I use 'damo record' to sample the 'stairs' demo. > damo record "./masim ./configs/stairs.cfg" > 2. Then I use 'damo report' to show the results. > damo report heats --address_range xxx xxx --time_range xxx xxx --heatmap > stdout --stdout_heatmap_color emotion > The result doesn't show like a stair. I wrote a userspace demo to access a > certain address range in loop and use DAMON to sample the demo. I added > trace_print in 'damon_va_check_access()' and found out the pages in the address > range are not always detected as accessed, which is not expected. When I disable > transparent_hugepage by chance, the pages are marked as accessed. Then I test > the 'stairs' demo again, the result is correct. It seems that, only when > transparent_hugepage' is disabled, the access check works. I don't know where > the bug is, the software or the hardware ? Appreciate it if you have time to > reply. Thanks ! > > Thanks, > Xiongfeng >
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