Willy Tarreau b23f04260b MINOR: tasks: add DEBUG_TASK to report caller info in a task ... The idea is to know who woke a task up, by recording the last two callers in a rotating mode. For now it's trivial with task_wakeup() but tasklet_wakeup_on() will require quite some more changes. This typically gives this from the debugger: (gdb) p t->debug $2 = { caller_file = {0x0, 0x8c0d80 "src/task.c"}, caller_line = {0, 260}, caller_idx = 1 } or this: (gdb) p t->debug $6 = { caller_file = {0x7fffe40329e0 "", 0x885feb "src/stream.c"}, caller_line = {284, 284}, caller_idx = 1 } But it also provides a trivial macro allowing to simply place a call in a task/tasklet handler that needs to be observed: DEBUG_TASK_PRINT_CALLER(t); Then starting haproxy this way would trivially yield such info: $ ./haproxy -db -f test.cfg | sort | uniq -c | sort -nr 199992 h1_io_cb woken up from src/sock.c:797 51764 h1_io_cb woken up from src/mux_h1.c:3634 65 h1_io_cb woken up from src/connection.c:169 45 h1_io_cb woken up from src/sock.c:777		2021-02-18 10:42:07 +01:00
..
haproxy	MINOR: tasks: add DEBUG_TASK to report caller info in a task	2021-02-18 10:42:07 +01:00
import	BUG/MINOR: xxhash: make sure armv6 uses memcpy()	2021-02-04 17:14:58 +01:00