Messages in this thread | | | Date | Thu, 28 May 2015 21:19:01 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/6] x86, pmem: add PMEM API for persistent memory |
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On 05/28/2015 05:02 PM, Dan Williams wrote: > > Hmm, yes, but I believe Ross (on vacation now) was following the > precedent set by commit cd8ddf1a2800 "x86: clflush_page_range needs > mfence" whereby the api handles all necessary fencing internally. > Shall we introduce something like __unordered_clflush_cache_range() > for arch_persistent_flush() to use with the understanding it will be > following up with the wmb() in arch_persistent_sync()? >
Are we ever going to have arch_persistent_sync() without arch_persistent_flush()?
However, thinking about it, it would be more efficient to do all flushes first and then have a single barrier.
-hpa
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