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Allow the artificial profile frames to be adjusted as needed by the user.

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While here update for armv6 to a tested value.

Submitted by:	Howard Su <howard0su@gmail.com>
Reviewed by:	stat
Differential Revision:	https://reviews.freebsd.org/D4315
This commit is contained in:
andrew 2015-12-05 10:00:01 +00:00
parent 67195f5ef1
commit ecf3965dfa
1 changed files with 9 additions and 6 deletions
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15
sys/cddl/dev/profile/profile.c
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@ -50,6 +50,7 @@
#include <sys/proc.h>
#include <sys/selinfo.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/unistd.h>
#include <machine/cpu.h>
@ -134,10 +135,7 @@ struct profile_probe_percpu;
#endif
#ifdef __arm__
/*
* At least on ARMv7, this appears to work quite well.
*/
#define PROF_ARTIFICIAL_FRAMES 10
#define PROF_ARTIFICIAL_FRAMES 3
#endif
#ifdef __aarch64__
@ -233,7 +231,12 @@ static dtrace_pops_t profile_pops = {
static struct cdev *profile_cdev;
static dtrace_provider_id_t profile_id;
static hrtime_t profile_interval_min = NANOSEC / 5000; /* 5000 hz */
static int profile_aframes = 0; /* override */
static int profile_aframes = PROF_ARTIFICIAL_FRAMES;
SYSCTL_DECL(_kern_dtrace);
SYSCTL_NODE(_kern_dtrace, OID_AUTO, profile, CTLFLAG_RD, 0, "DTrace profile parameters");
SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
0, "Skipped frames for profile provider");
static sbintime_t
nsec_to_sbt(hrtime_t nsec)
@ -352,7 +355,7 @@ profile_create(hrtime_t interval, char *name, int kind)
prof->prof_kind = kind;
prof->prof_id = dtrace_probe_create(profile_id,
NULL, NULL, name,
profile_aframes ? profile_aframes : PROF_ARTIFICIAL_FRAMES, prof);
profile_aframes, prof);
}
/*ARGSUSED*/