Messages in this thread | | | From | Denys Vlasenko <> | Date | Fri, 4 Mar 2011 15:31:15 +0100 | Subject | Re: [RFC] Proposal for ptrace improvements |
| |
On Fri, Mar 4, 2011 at 3:07 PM, Tejun Heo <tj@kernel.org> wrote: > Hello, > > On Fri, Mar 04, 2011 at 02:59:32PM +0100, Denys Vlasenko wrote: >> I would rather speed strace up than slow it down further, even if >> slightly. > > The question to ask is at what cost? If mostly unnoticeable slow down > makes the API cleaner, I'll go that way. Everything is a tradeoff.
# time sh -c 'ls -lR /usr/share >/dev/null' real 0m2.633s user 0m0.540s sys 0m2.047s
strace without PTRACE_GETSIGINFO:
# time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m47.023s user 0m3.843s sys 0m29.050s # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m48.799s user 0m3.808s sys 0m29.736s # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m47.695s user 0m3.965s sys 0m29.047s
strace with PTRACE_GETSIGINFO:
# time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m51.958s user 0m3.899s sys 0m31.584s # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m53.773s user 0m3.920s sys 0m29.713s # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null' exit_group(0) = ? real 0m51.625s user 0m3.961s sys 0m30.970s
-- vda -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |