Marcelo Tosatti wrote: >> >> While aging is not too hard to do, I don't think it would add much in >> practice; we rarely observe mmu shadow pages being recycled due to >> memory pressure. So this is mostly helpful for preventing a VM from >> pinning memory when under severe memory pressure, where we don't expect >> good performance anyway. >> > > Issue is that the shrinker callback will not be called only under > severe memory pressure, but for normal system pressure too. > >
How much shrinkage goes on under normal pressure? Rebuilding a single shadow page costs a maximum of 512 faults (so about 1 msec). If the shrinker evicts one entry per second, this is a performance hiy of 0.1%. Perhaps if we set the cost high enough, the normal eviction rate will be low enough. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
