On 06/08/2015 10:45 AM, Ingo Molnar wrote: > As per my measurements the __flush_tlb_single() primitive (which you use in > patch > #2) is very expensive on most Intel and AMD CPUs. It barely makes sense for a > 2 > pages and gets exponentially worse. It's probably done in microcode and its > performance is horrible.
I discussed this a bit in commit a5102476a2. I'd be curious what numbers you came up with. But, don't we have to take in to account the cost of refilling the TLB in addition to the cost of emptying it? The TLB size is historically increasing on a per-core basis, so isn't this refill cost only going to get worse? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
