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Make the number of fasttrap probes and the size of the trace points hash table

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tunable via sysctl or kernel tunables.

Illumos allows this parameters to be changed via the fasttrap.conf configuration
file, but FreeBSD code hardcoded the parameters.  Expose them under
the kern.dtrace.fasttrap sysctl tree.

MFC after:	2 weeks
This commit is contained in:
Stanislav Sedov 2015-12-01 00:24:54 +00:00
parent 10b2e06e3e
commit 314eeef290
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=291545
1 changed files with 21 additions and 8 deletions
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29
sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
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@ -63,6 +63,7 @@
#ifndef illumos
#include <sys/dtrace_bsd.h>
#include <sys/eventhandler.h>
#include <sys/sysctl.h>
#include <sys/u8_textprep.h>
#include <sys/user.h>
#include <vm/vm.h>
@ -172,13 +173,14 @@ static volatile uint64_t fasttrap_mod_gen;
/*
* When the fasttrap provider is loaded, fasttrap_max is set to either
* FASTTRAP_MAX_DEFAULT or the value for fasttrap-max-probes in the
* fasttrap.conf file. Each time a probe is created, fasttrap_total is
* incremented by the number of tracepoints that may be associated with that
* probe; fasttrap_total is capped at fasttrap_max.
* FASTTRAP_MAX_DEFAULT, or the value for fasttrap-max-probes in the
* fasttrap.conf file (Illumos), or the value provied in the loader.conf (FreeBSD).
* Each time a probe is created, fasttrap_total is incremented by the number
* of tracepoints that may be associated with that probe; fasttrap_total is capped
* at fasttrap_max.
*/
#define FASTTRAP_MAX_DEFAULT 250000
static uint32_t fasttrap_max;
static uint32_t fasttrap_max = FASTTRAP_MAX_DEFAULT;
static uint32_t fasttrap_total;
/*
@ -226,6 +228,17 @@ static kmutex_t fasttrap_cpuc_pid_lock[MAXCPU];
static eventhandler_tag fasttrap_thread_dtor_tag;
#endif
static unsigned long tpoints_hash_size = FASTTRAP_TPOINTS_DEFAULT_SIZE;
#ifdef __FreeBSD__
SYSCTL_DECL(_kern_dtrace);
SYSCTL_NODE(_kern_dtrace, OID_AUTO, fasttrap, CTLFLAG_RD, 0, "DTrace fasttrap parameters");
SYSCTL_UINT(_kern_dtrace_fasttrap, OID_AUTO, max_probes, CTLFLAG_RWTUN, &fasttrap_max,
FASTTRAP_MAX_DEFAULT, "Maximum number of fasttrap probes");
SYSCTL_ULONG(_kern_dtrace_fasttrap, OID_AUTO, tpoints_hash_size, CTLFLAG_RDTUN, &tpoints_hash_size,
FASTTRAP_TPOINTS_DEFAULT_SIZE, "Size of the tracepoint hash table");
#endif
static int
fasttrap_highbit(ulong_t i)
{
@ -2480,8 +2493,6 @@ fasttrap_load(void)
#ifdef illumos
fasttrap_max = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
"fasttrap-max-probes", FASTTRAP_MAX_DEFAULT);
#else
fasttrap_max = FASTTRAP_MAX_DEFAULT;
#endif
fasttrap_total = 0;
@ -2492,12 +2503,14 @@ fasttrap_load(void)
nent = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
"fasttrap-hash-size", FASTTRAP_TPOINTS_DEFAULT_SIZE);
#else
nent = FASTTRAP_TPOINTS_DEFAULT_SIZE;
nent = tpoints_hash_size;
#endif
if (nent == 0 || nent > 0x1000000)
nent = FASTTRAP_TPOINTS_DEFAULT_SIZE;
tpoints_hash_size = nent;
if (ISP2(nent))
fasttrap_tpoints.fth_nent = nent;
else