On Thu, Sep 26, 2019 at 9:56 AM Tony Jones <tonyj@xxxxxxx> wrote:
>
> On 9/18/19 7:38 AM, Yafang Shao wrote:
> > A new perf script page-reclaim is introduced in this patch. This new script
> > is used to report the page reclaim details. The possible usage of this
> > script is as bellow,
> > - identify latency spike caused by direct reclaim
> > - whehter the latency spike is relevant with pageout
> > - why is page reclaim requested, i.e. whether it is because of memory
> > fragmentation
> > - page reclaim efficiency
> > etc
> > In the future we may also enhance it to analyze the memcg reclaim.
> >
> > Bellow is how to use this script,
> > # Record, one of the following
> > $ perf record -e 'vmscan:mm_vmscan_*' ./workload
> > $ perf script record page-reclaim
> >
> > # Report
> > $ perf script report page-reclaim
> >
> > # Report per process latency
> > $ perf script report page-reclaim -- -p
>
>
> I tested it with global-dhp__pagereclaim-performance from mmtests and got what appears to be reasonable results and the output looks correct and useful. However I'm not a vm expert so I can't comment further. Hopefully someone on linux-mm can give more specific feedback.
>
+ Mel
Hi Mel,
This is motivated by
Documentation/trace/postprocess/trace-vmscan-postprocess.pl created by
you.
Could you pls. help take a look ?
Thanks
Yafang
> There is one issue with Python3, see below. I didn't test with Python2.
>
> >
> > + @classmethod
> > + def shrink_inactive(cls, pid, scanned, reclaimed, flags):
> > + event = cls.events.get(pid)
> > + if event and event.tracing():
> > + # RECLAIM_WB_ANON 0x1
> > + # RECLAIM_WB_FILE 0x2
> > + _type = (flags & 0x2) >> 1
> > + event.process_lru(lru[_type], scanned, reclaimed)
> > +
> > + @classmethod
> > + def writepage(cls, pid, flags):
> > + event = cls.events.get(pid)
> > + if event and event.tracing():
> > + # RECLAIM_WB_ANON 0x1
> > + # RECLAIM_WB_FILE 0x2
> > + # RECLAIM_WB_SYNC 0x4
> > + # RECLAIM_WB_ASYNC 0x8
> > + _type = (flags & 0x2) >> 1
> > + _io = (flags & 0x4) >> 2
> > +
> > + event.process_writepage(lru[_type], sync_io[_io])
> > +
> > + @classmethod
>
> Space indentation on line above. For python3 this results in:
>
> File "tools/perf/scripts/python/page-reclaim.py", line 217
> @classmethod
> ^
> TabError: inconsistent use of tabs and spaces in indentation
>
> > + def iterate_proc(cls):
> > + if show_opt != Show.DEFAULT:
> > + print("\nPer process latency (ms):")
> > + print_proc_latency(latency_metric, 'pid', '[comm]')
> > +
> > + if show_opt == Show.VERBOSE:
> > + print("%20s %s" % ('timestamp','latency(ns)'))
>
>
> Thanks
>
> Tony
>
