Messages in this thread | | | Subject | Re: [PATCH] mm: thp: remove use_zero_page sysfs knob | From | Yang Shi <> | Date | Mon, 23 Jul 2018 14:52:43 -0700 |
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On 7/23/18 1:31 PM, David Rientjes wrote: > On Fri, 20 Jul 2018, Yang Shi wrote: > >> I agree to keep it for a while to let that security bug cool down, however, if >> there is no user anymore, it sounds pointless to still keep a dead knob. >> > It's not a dead knob. We use it, and for reasons other than > CVE-2017-1000405. To mitigate the cost of constantly compacting memory to > allocate it after it has been freed due to memry pressure, we can either > continue to disable it, allow it to be persistently available, or use a > new value for use_zero_page to specify it should be persistently > available.
My understanding is the cost of memory compaction is *not* unique for huge zero page, right? It is expected when memory pressure is met, even though huge zero page is disabled.
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