[PATCH 0/4] remote thread listing: get rid of unnecessary "thread alive?" traffic

Pedro Alves
2014-10-02T16:21:41Z

When GDB wants to sync the thread list with the target's (e.g., due to
"info threads"), it ends up sending a bunch of T (thread alive?)
packets before fetching the current remote thread list:

Sending packet: $Tp2141.2150#82...Packet received: OK
Sending packet: $Tp2141.214f#b7...Packet received: OK
Sending packet: $Tp2141.2141#82...Packet received: OK
Sending packet: $qXfer:threads:read::0,fff#03...Packet received: l<threads>\n<thread id="p2141.2141" core="2"/>\n<thread id="p2141.214f" core="1"/>\n<thread id="p2141.2150" core="2"/>\n</threads>\n

That's wasteful, given that we can tell whether a thread is gone from
the fact that it won't appear in the list returned by
qXfer:threads:read (or qfThreadInfo/qsThreadInfo, or qL).

This series eliminates those unnecessary queries.

IOW, after this series, the above becomes simply:

Sending packet: $qXfer:threads:read::0,fff#03...Packet received: l<threads>\n<thread id="p2141.2141" core="2"/>\n<thread id="p2141.214f" core="1"/>\n<thread id="p2141.2150" core="2"/>\n</threads>\n

Pedro Alves (4):
Merge remote thread listing methods
Push pruning old threads down to the target
remote: get rid of all the T packets when synching the thread list
DEC threads: Simplify updating the thread list

gdb/ada-tasks.c | 4 +-
gdb/bsd-uthread.c | 6 +-
gdb/corelow.c | 2 +-
gdb/dec-thread.c | 80 ++++--------
gdb/gdbthread.h | 12 ++
gdb/linux-thread-db.c | 6 +-
gdb/nto-procfs.c | 10 +-
gdb/obsd-nat.c | 6 +-
gdb/procfs.c | 10 +-
gdb/ravenscar-thread.c | 10 +-
gdb/record-btrace.c | 10 +-
gdb/remote.c | 339 +++++++++++++++++++++++++++++--------------------
gdb/sol-thread.c | 21 +--
gdb/target-delegates.c | 22 ++--
gdb/target.c | 4 +-
gdb/target.h | 6 +-
gdb/thread.c | 8 +-
17 files changed, 301 insertions(+), 255 deletions(-)

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1.9.3