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

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

[npremji at redhat dot com]

 

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           Summary: new libunwind bindings test-ptrace-mapper very slow.
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: npremji at redhat dot com


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

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

[npremji at redhat dot com]

------- Additional Comments From npremji at redhat dot com  2007-03-20 21:48 -------
Created an attachment (id=1637)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1637&action=view)
libunwind 20070224 straced.


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

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

[npremji at redhat dot com]

------- Additional Comments From npremji at redhat dot com  2007-03-20 21:50 -------
Created an attachment (id=1638)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1638&action=view)
libunwind 0.98.5 straced.


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

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

[npremji at redhat dot com]

------- 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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           What    |Removed                     |Added
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OtherBugsDependingO|                            |3076
              nThis|                            |


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

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

[npremji at redhat dot com]

------- Additional Comments From npremji at redhat dot com  2007-03-20 23:03 -------
upstream bug:
https://savannah.nongnu.org/bugs/index.php?19365

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

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