[Bug general/4226] new libunwind bindings test-ptrace-mapper very slow.

["npremji at redhat dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From npremji at redhat dot com  2007-03-20 22:49 -------
It seems as though this bug has to do with caching. The logs show that reads are
done when no ptrace-continue has occurred and the maps should still be valid.

<cagney> ptrace(PTRACE_PEEKUSER, 24688, 4*EIP, [0x56c402]) = 0
<cagney> open("/proc/24688/maps", O_RDONLY)      = 3
<cagney> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7f15000
<cagney> read(3, "0056c000-0056d000 r-xp 0056c000 "..., 4096) = 4060
<cagney> read(3, "b7fb6000-b7fb7000 -w-p b7fb6000 "..., 4096) = 1574
<cagney> read(3, "", 4096)                       = 0
<cagney> close(3)                                = 0
<cagney> munmap(0xb7f15000, 4096)                = 0
<cagney> rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
<cagney> open("/proc/24688/maps", O_RDONLY)      = 3
<cagney> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7f15000
<cagney> read(3, "0056c000-0056d000 r-xp 0056c000 "..., 4096) = 4060
<cagney> read(3, "b0aec000-b0aed000 -w-p b0aec000 "..., 4096) = 4059

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http://sourceware.org/bugzilla/show_bug.cgi?id=4226

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