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MINOR: global: add a command-line option to enable CPU binding debugging

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During development, everything related to CPU binding and the CPU topology
is debugged using state dumps at various places, but it does make sense to
have a real command line option so that this remains usable in production
to help users figure why some CPUs are not used by default. Let's add
"-dc" for this. Since the list of global.tune.options values is almost
full and does not 100% match this option, let's add a new "tune.debug"
field for this.
This commit is contained in:
Willy Tarreau 2025-01-23 09:02:41 +01:00
parent 94543d7b65
commit f0661e79fe
3 changed files with 14 additions and 0 deletions
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3
doc/management.txt
View File

@ -394,6 +394,9 @@ list of options is :
foreground. It is mainly used during development or during small tests, as
Ctrl-C is enough to stop the process. Never use it in an init script.
-dc : enable CPU affinity debugging. The list of selected and evicted CPUs as
well as their topology will be reported before starting.
-de : disable the use of the "epoll" poller. It is equivalent to the "global"
section's keyword "noepoll". It is mostly useful when suspecting a bug
related to this poller. On systems supporting epoll, the fallback will

4
include/haproxy/global-t.h
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@ -88,6 +88,9 @@
#define GTUNE_QUIC_CC_HYSTART (1<<29)
#define GTUNE_QUIC_NO_UDP_GSO (1<<30)
/* subsystem-specific debugging options for tune.debug */
#define GDBG_CPU_AFFINITY (1U<< 0)
#define NO_ZERO_COPY_FWD 0x0001 /* Globally disable zero-copy FF */
#define NO_ZERO_COPY_FWD_PT 0x0002 /* disable zero-copy FF for PT (recv & send are disabled automatically) */
#define NO_ZERO_COPY_FWD_H1_RCV 0x0004 /* disable zero-copy FF for H1 on received */
@ -171,6 +174,7 @@ struct global {
int max_rules_at_once; /* max number of rules excecuted in a single evaluation loop */
int maxaccept; /* max number of consecutive accept() */
int options; /* various tuning options */
uint debug; /* various debugging options (GDBG_*) */
int runqueue_depth;/* max number of tasks to run at once */
uint recv_enough; /* how many input bytes at once are "enough" */
uint bufsize; /* buffer size in bytes, defaults to BUFSIZE */

7
src/haproxy.c
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@ -688,6 +688,9 @@ static void usage(char *name)
#endif
#if defined(HA_HAVE_DUMP_LIBS)
" -dL dumps loaded object files after config checks\n"
#endif
#if defined(USE_CPU_AFFINITY)
" -dc dumps the list of selected and evicted CPUs\n"
#endif
" -dK{class[,...]} dump registered keywords (use 'help' for list)\n"
" -dr ignores server address resolution failures\n"
@ -1492,6 +1495,10 @@ static void init_args(int argc, char **argv)
#if defined(SO_REUSEPORT)
else if (*flag == 'd' && flag[1] == 'R')
protocol_clrf_all(PROTO_F_REUSEPORT_SUPPORTED);
#endif
#if defined(USE_CPU_AFFINITY)
else if (*flag == 'd' && flag[1] == 'c')
global.tune.debug |= GDBG_CPU_AFFINITY;
#endif
else if (*flag == 'd' && flag[1] == 'F')
global.tune.options &= ~GTUNE_USE_FAST_FWD;