mozilla/rr — pull request #245 by cgjones (2013-07-18 18:42:48+00:00)
Title: Wrap two of the top buffer-flushing syscalls.

After this, the top 10 are

why	count
-------	-----
-1019	815 (time slice)
240	409 (futex)
295	241 (un-wrappable openat)
195	184 (un-wrappable stat)
168	177 (poll)
102	172 (socketcall)
140	144 (_llseek)
265	104 (clock_gettime)
192	71 (mmap2)
5	55 (un-wrappable open)

Starting to converge on the usual suspects seen in #242.

With this patch, FF started up under 24s for the first time. So we're at about a 10-15% improvement in startup from adding a few more wrappers.