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From: Jeremy F. <je...@go...> - 2004-03-21 23:42:03
|
Quoting "KJK::Hyperion" <no...@li...>: > At 02.36 08/03/2004, Jeremy Fitzhardinge wrote: > >Two linear address spaces (ie, two separate unix processes) would allow > > >the client to have full run of one whole address space, but there's no > > >clear way in which generated code could have efficient access to both > > >address spaces. > > couldn't the memory for the data be shared between the two processes? > and > offsets used in place of pointers? Well, the data is the big thing, so you'd stll have the problem of fitting everything into the one adderss space. memcheck uses 9 bits of shadow for every 8 bits of client memory, so if they're both in the same address space, you're always going to be able to use less than half the avaliable adderss space for your program. > but to me it looks like it isn't real multithreading. From the papers > I've > read, it looks like it's emulated. Would it be problematic to make > Valgrind > truly multithreaded? That would be very hard work, since every instruction could potentially be concurrently modifying some structure which is being used by another thread. It is really multithreaded as far as the client is concerned; the main problem is that it will only ever use 1 CPU on an SMP system. > >I guess this would be an elaboration of the games we play currently > with > >signals? > > yes, except a lot easier :-) Yes, I think I can see how they can be handled. > mov eax, <system call number> > mov edx, <very high, fixed address> > call edx > retn <size of parameters> > > The "very high" is an unbelievable 0x7FFE0300, straight in the middle of Hm, that isn't all that high. Does that mean a process has less than 2G of available address space under XP? > It looks like that the actual system call thunking code (sysenter, it > turns > out) is generated by the kernel at boot time, and written there to > shield > user-mode code from CPU subtleties. Linux does the same thing these days; the syscall entrypoint is at 0xffffd000 or so, and it contains whatever is the most efficient way of doing a syscall on this CPU. J |
|
From: <js...@ac...> - 2004-03-21 04:07:26
|
Nightly build on phoenix ( SuSE 8.2 ) started at 2004-03-21 04:00:00 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow seg_override: valgrind ./seg_override sha1_test: valgrind ./sha1_test shortpush: valgrind ./shortpush shorts: valgrind ./shorts smc1: valgrind ./smc1 susphello: valgrind ./susphello syscall-restart1: valgrind ./syscall-restart1 syscall-restart2: valgrind ./syscall-restart2 system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 145 tests, 5 stderr failures, 0 stdout failures ================= corecheck/tests/as_mmap (stderr) corecheck/tests/fdleak_fcntl (stderr) helgrind/tests/inherit (stderr) memcheck/tests/writev (stderr) memcheck/tests/zeropage (stderr) make: *** [regtest] Error 1 |
|
From: <js...@ac...> - 2004-03-21 03:46:36
|
Nightly build on nemesis ( SuSE 9.0 ) started at 2004-03-21 03:50:00 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 145 tests, 13 stderr failures, 0 stdout failures ================= corecheck/tests/as_mmap (stderr) corecheck/tests/fdleak_cmsg (stderr) corecheck/tests/fdleak_creat (stderr) corecheck/tests/fdleak_dup (stderr) corecheck/tests/fdleak_dup2 (stderr) corecheck/tests/fdleak_fcntl (stderr) corecheck/tests/fdleak_ipv4 (stderr) corecheck/tests/fdleak_open (stderr) corecheck/tests/fdleak_pipe (stderr) corecheck/tests/fdleak_socketpair (stderr) helgrind/tests/inherit (stderr) memcheck/tests/writev (stderr) memcheck/tests/zeropage (stderr) make: *** [regtest] Error 1 |
|
From: Tom H. <to...@co...> - 2004-03-21 03:23:07
|
Nightly build on dunsmere ( Fedora Core 1 ) started at 2004-03-21 03:20:02 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow == 150 tests, 16 stderr failures, 1 stdout failure ================= corecheck/tests/fdleak_cmsg (stderr) corecheck/tests/fdleak_creat (stderr) corecheck/tests/fdleak_dup (stderr) corecheck/tests/fdleak_dup2 (stderr) corecheck/tests/fdleak_fcntl (stderr) corecheck/tests/fdleak_ipv4 (stderr) corecheck/tests/fdleak_open (stderr) corecheck/tests/fdleak_pipe (stderr) corecheck/tests/fdleak_socketpair (stderr) helgrind/tests/inherit (stderr) memcheck/tests/buflen_check (stderr) memcheck/tests/execve (stderr) memcheck/tests/fwrite (stderr) memcheck/tests/trivialleak (stderr) memcheck/tests/weirdioctl (stderr) memcheck/tests/writev (stderr) none/tests/exec-sigmask (stdout) make: *** [regtest] Error 1 |
|
From: Tom H. <th...@cy...> - 2004-03-21 03:17:51
|
Nightly build on audi ( Red Hat 9 ) started at 2004-03-21 03:15:02 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow rcl_assert: valgrind ./rcl_assert rcrl: valgrind ./rcrl readline1: valgrind ./readline1 resolv: valgrind ./resolv seg_override: valgrind ./seg_override sha1_test: valgrind ./sha1_test shortpush: valgrind ./shortpush shorts: valgrind ./shorts smc1: valgrind ./smc1 susphello: valgrind ./susphello syscall-restart1: valgrind ./syscall-restart1 syscall-restart2: valgrind ./syscall-restart2 system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 150 tests, 1 stderr failure, 0 stdout failures ================= helgrind/tests/inherit (stderr) make: *** [regtest] Error 1 |
|
From: Tom H. <th...@cy...> - 2004-03-21 03:13:13
|
Nightly build on ginetta ( Red Hat 8.0 ) started at 2004-03-21 03:10:03 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow sha1_test: valgrind ./sha1_test shortpush: valgrind ./shortpush shorts: valgrind ./shorts smc1: valgrind ./smc1 susphello: valgrind ./susphello syscall-restart1: valgrind ./syscall-restart1 syscall-restart2: valgrind ./syscall-restart2 system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 150 tests, 6 stderr failures, 0 stdout failures ================= helgrind/tests/deadlock (stderr) helgrind/tests/inherit (stderr) helgrind/tests/race (stderr) helgrind/tests/race2 (stderr) memcheck/tests/nanoleak (stderr) memcheck/tests/trivialleak (stderr) make: *** [regtest] Error 1 |
|
From: Tom H. <th...@cy...> - 2004-03-21 03:08:08
|
Nightly build on alvis ( Red Hat 7.3 ) started at 2004-03-21 03:05:03 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow shortpush: valgrind ./shortpush shorts: valgrind ./shorts smc1: valgrind ./smc1 susphello: valgrind ./susphello syscall-restart1: valgrind ./syscall-restart1 syscall-restart2: valgrind ./syscall-restart2 system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 150 tests, 6 stderr failures, 1 stdout failure ================= helgrind/tests/inherit (stderr) memcheck/tests/badfree-2trace (stderr) memcheck/tests/badjump (stderr) memcheck/tests/brk (stderr) memcheck/tests/error_counts (stdout) memcheck/tests/new_nothrow (stderr) memcheck/tests/writev (stderr) make: *** [regtest] Error 1 |
|
From: Tom H. <th...@cy...> - 2004-03-21 03:06:20
|
Nightly build on standard ( Red Hat 7.2 ) started at 2004-03-21 03:00:03 GMT Checking out source tree ... done Configuring ... done Building ... done Running regression tests ... done Last 20 lines of log.verbose follow rcrl: valgrind ./rcrl readline1: valgrind ./readline1 resolv: valgrind ./resolv seg_override: valgrind ./seg_override sha1_test: valgrind ./sha1_test shortpush: valgrind ./shortpush shorts: valgrind ./shorts smc1: valgrind ./smc1 susphello: valgrind ./susphello syscall-restart1: valgrind ./syscall-restart1 syscall-restart2: valgrind ./syscall-restart2 system: valgrind ./system yield: valgrind ./yield -- Finished tests in none/tests ---------------------------------------- == 150 tests, 2 stderr failures, 0 stdout failures ================= helgrind/tests/inherit (stderr) memcheck/tests/badfree-2trace (stderr) make: *** [regtest] Error 1 |