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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ILK/HSW]igt/gem_tiled_swapping randomly causes OOM killer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72742">bug 72742</a>
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<td>dave@sr71.net
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ILK/HSW]igt/gem_tiled_swapping randomly causes OOM killer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72742#c66">Comment # 66</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ILK/HSW]igt/gem_tiled_swapping randomly causes OOM killer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72742">bug 72742</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>A request for more debug info from Dave Hansen:
"We have tracepoints for the shrinkers in here (it says slab, but it's
all the shrinkers, I checked):
/sys/kernel/debug/tracing/events/vmscan/mm_shrink_slab_*/enable
and another for OOMs:
/sys/kernel/debug/tracing/events/oom/enable
Could you collect a trace during one of these OOM events and see what
the i915 shrinker is doing? Just enable those two and then collect a
copy of:
/sys/kernel/debug/tracing/trace
That'll give us some insight about how well the shrinker is working. If
the VM gave up on calling in to it, it might reveal why we didn't get
all the way down in to i915_gem_shrink_all()."
I think the output (trace.dat) of
$ sudo trace-cmd record -e vmscan:mm_shrink_slab_start -e
vmscan:mm_shrink_slab_end -e oom ./gem_tiled_swapping
should suffice.</pre>
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