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Index: head/sys/conf/NOTES
===================================================================
--- head/sys/conf/NOTES
+++ head/sys/conf/NOTES
@@ -578,6 +578,17 @@
#
options STACK
+#
+# The NUM_CORE_FILES option specifies the limit for the number of core
+# files generated by a particular process, when the core file format
+# specifier includes the %I pattern. Since we only have 1 character for
+# the core count in the format string, meaning the range will be 0-9, the
+# maximum value allowed for this option is 10.
+# This core file limit can be adjusted at runtime via the debug.ncores
+# sysctl.
+#
+options NUM_CORE_FILES=5
+
#####################################################################
# PERFORMANCE MONITORING OPTIONS
Index: head/sys/conf/options
===================================================================
--- head/sys/conf/options
+++ head/sys/conf/options
@@ -65,6 +65,7 @@
EARLY_PRINTF opt_global.h
TEXTDUMP_PREFERRED opt_ddb.h
TEXTDUMP_VERBOSE opt_ddb.h
+NUM_CORE_FILES opt_global.h
# Miscellaneous options.
ADAPTIVE_LOCKMGRS
Index: head/sys/kern/kern_sig.c
===================================================================
--- head/sys/kern/kern_sig.c
+++ head/sys/kern/kern_sig.c
@@ -3142,8 +3142,12 @@
* We only have 1 character for the core count in the format
* string, so the range will be 0-9
*/
-#define MAX_NUM_CORES 10
-static int num_cores = 5;
+#define MAX_NUM_CORE_FILES 10
+#ifndef NUM_CORE_FILES
+#define NUM_CORE_FILES 5
+#endif
+CTASSERT(NUM_CORE_FILES >= 0 && NUM_CORE_FILES <= MAX_NUM_CORE_FILES);
+static int num_cores = NUM_CORE_FILES;
static int
sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
@@ -3155,8 +3159,8 @@
error = sysctl_handle_int(oidp, &new_val, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
- if (new_val > MAX_NUM_CORES)
- new_val = MAX_NUM_CORES;
+ if (new_val > MAX_NUM_CORE_FILES)
+ new_val = MAX_NUM_CORE_FILES;
if (new_val < 0)
new_val = 0;
num_cores = new_val;

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