Im not sure, but I assume that the kernel writes the core out as the process reads it. Will need to dig into the kernel code to confirm.
Mark Chandler Battle.Net Engineering Systems | Blizzard Entertainment (P) 949-955-1380 x15353 -----Original Message----- From: Greg Clayton [mailto:gclay...@apple.com] Sent: Wednesday, November 04, 2015 10:13 AM To: Mark Chandler <mchand...@blizzard.com> Cc: Todd Fiala <todd.fi...@gmail.com>; Pavel Labath <lab...@google.com>; lldb-dev@lists.llvm.org Subject: Re: [lldb-dev] Attaching to a stopped (cored) process hangs lldb-server So the entire core file is in memory somehow and when it is read from STDIN will be then be freed? Seems like a really lame way to pass the core file around as it requires up to 2x the size of the core in memory. We could add a new version of SBTarget::LoadCore() like: SBProcess SBTarget::LoadCoreFromData(const void *data, uint64_t data_len); But this will be a memory hog depending on if the memory from STDIN containing the core file gets freed immediately after it is consumed, or if the data is still around. > On Nov 4, 2015, at 10:05 AM, Mark Chandler <mchand...@blizzard.com> wrote: > > The problem becomes when the core data on stdin is gigabytes in size and > there is little to no diskspace or memory (as the process is still around) to > store/process the data. > > > Mark Chandler > Battle.Net Engineering Systems | Blizzard Entertainment > (P) 949-955-1380 x15353 > > -----Original Message----- > From: Greg Clayton [mailto:gclay...@apple.com] > Sent: Wednesday, November 04, 2015 10:01 AM > To: Todd Fiala <todd.fi...@gmail.com> > Cc: Mark Chandler <mchand...@blizzard.com>; Pavel Labath <lab...@google.com>; > lldb-dev@lists.llvm.org > Subject: Re: [lldb-dev] Attaching to a stopped (cored) process hangs > lldb-server > > >> On Nov 4, 2015, at 9:47 AM, Todd Fiala <todd.fi...@gmail.com> wrote: >> >> Although doing any kind of waitpid() in the case of a core file doesn't make >> sense. > > The process is still around. The process is being handed the core file via > STDIN, but the process is still around and this tool is attaching to that > process and ignoring the core file data. I would vote to use the core file > data if the tool is checked in, or at least provide an option to either > attach to the process or use the core file data... > > Greg _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
