Em Tue, Oct 15, 2013 at 08:04:15AM -0600, David Ahern escreveu: > On 10/8/13 11:59 PM, Ingo Molnar wrote: > > 2)
> > Yet another method would be to avoid the copies altogether via the splice > > system-call - see: > > git grep splice kernel/trace/ > > To make splice low-overhead we'd have to introduce a mode to not mmap > > the data part of the perf ring-buffer and splice the data straight > > from the perf fd into a temporary pipe and over from the pipe into > > the target file (or socket). > I looked into splice and it was not clear it would be a good match. > First, perf is setup to pull data from mmap's and there is not a 1:1 > association between mmap's and fd's (fd_in for splice). Second and Jiri and PeterZ probaby will have comments here... ;-) :-) Jiri even have patches, IIRC. - Arnaldo -- 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/
