diff options
Diffstat (limited to 'usr.bin/procstat/procstat_kstack.c')
| -rw-r--r-- | usr.bin/procstat/procstat_kstack.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/usr.bin/procstat/procstat_kstack.c b/usr.bin/procstat/procstat_kstack.c new file mode 100644 index 000000000000..49505bcb9efc --- /dev/null +++ b/usr.bin/procstat/procstat_kstack.c @@ -0,0 +1,247 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2007 Robert N. M. Watson + * Copyright (c) 2015 Allan Jude <allanjude@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/sysctl.h> +#include <sys/user.h> + +#include <err.h> +#include <errno.h> +#include <libprocstat.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "procstat.h" + +/* + * Walk the stack trace provided by the kernel and reduce it to what we + * actually want to print. This involves stripping true instruction pointers, + * frame numbers, and carriage returns as generated by stack(9). If -kk is + * specified, print the function and offset, otherwise just the function. + */ +enum trace_state { TS_FRAMENUM, TS_PC, TS_AT, TS_FUNC, TS_OFF }; + +static enum trace_state +kstack_nextstate(enum trace_state ts) +{ + + switch (ts) { + case TS_FRAMENUM: + return (TS_PC); + + case TS_PC: + return (TS_AT); + + case TS_AT: + return (TS_FUNC); + + case TS_FUNC: + return (TS_OFF); + + case TS_OFF: + return (TS_FRAMENUM); + + default: + errx(-1, "kstack_nextstate"); + } +} + +static void +kstack_cleanup(const char *old, char *new, int kflag) +{ + enum trace_state old_ts, ts; + const char *cp_old; + char *cp_new; + + ts = TS_FRAMENUM; + for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) { + switch (*cp_old) { + case ' ': + case '\n': + case '+': + old_ts = ts; + ts = kstack_nextstate(old_ts); + if (old_ts == TS_OFF) { + *cp_new = ' '; + cp_new++; + } + if (kflag > 1 && old_ts == TS_FUNC) { + *cp_new = '+'; + cp_new++; + } + continue; + } + if (ts == TS_FUNC || (kflag > 1 && ts == TS_OFF)) { + *cp_new = *cp_old; + cp_new++; + } + } + *cp_new = '\0'; +} + +static void +kstack_cleanup_encoded(const char *old, char *new, int kflag) +{ + enum trace_state old_ts, ts; + const char *cp_old; + char *cp_new, *cp_loop, *cp_tofree, *cp_line; + + ts = TS_FRAMENUM; + if (kflag == 1) { + for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) { + switch (*cp_old) { + case '\n': + *cp_new = *cp_old; + cp_new++; + case ' ': + case '+': + old_ts = ts; + ts = kstack_nextstate(old_ts); + continue; + } + if (ts == TS_FUNC) { + *cp_new = *cp_old; + cp_new++; + } + } + *cp_new = '\0'; + cp_tofree = cp_loop = strdup(new); + } else + cp_tofree = cp_loop = strdup(old); + while ((cp_line = strsep(&cp_loop, "\n")) != NULL) { + if (strlen(cp_line) != 0 && *cp_line != 127) + xo_emit("{le:token/%s}", cp_line); + } + free(cp_tofree); +} + +/* + * Sort threads by tid. + */ +static int +kinfo_kstack_compare(const void *a, const void *b) +{ + + return ((const struct kinfo_kstack *)a)->kkst_tid - + ((const struct kinfo_kstack *)b)->kkst_tid; +} + +static void +kinfo_kstack_sort(struct kinfo_kstack *kkstp, int count) +{ + + qsort(kkstp, count, sizeof(*kkstp), kinfo_kstack_compare); +} + + +void +procstat_kstack(struct procstat *procstat, struct kinfo_proc *kipp) +{ + struct kinfo_kstack *kkstp, *kkstp_free; + struct kinfo_proc *kip, *kip_free; + char trace[KKST_MAXLEN], encoded_trace[KKST_MAXLEN]; + unsigned int i, j; + unsigned int kip_count, kstk_count; + + if ((procstat_opts & PS_OPT_NOHEADER) == 0) + xo_emit("{T:/%5s %6s %-19s %-19s %-29s}\n", "PID", "TID", "COMM", + "TDNAME", "KSTACK"); + + kkstp = kkstp_free = procstat_getkstack(procstat, kipp, &kstk_count); + if (kkstp == NULL) + return; + + /* + * We need to re-query for thread information, so don't use *kipp. + */ + kip = kip_free = procstat_getprocs(procstat, + KERN_PROC_PID | KERN_PROC_INC_THREAD, kipp->ki_pid, &kip_count); + + if (kip == NULL) { + procstat_freekstack(procstat, kkstp_free); + return; + } + + kinfo_kstack_sort(kkstp, kstk_count); + for (i = 0; i < kstk_count; i++) { + kkstp = &kkstp_free[i]; + + /* + * Look up the specific thread using its tid so we can + * display the per-thread command line. + */ + kipp = NULL; + for (j = 0; j < kip_count; j++) { + kipp = &kip_free[j]; + if (kkstp->kkst_tid == kipp->ki_tid) + break; + } + if (kipp == NULL) + continue; + + xo_emit("{k:process_id/%5d/%d} ", kipp->ki_pid); + xo_emit("{:thread_id/%6d/%d} ", kkstp->kkst_tid); + xo_emit("{:command/%-19s/%s} ", kipp->ki_comm); + xo_emit("{:thread_name/%-19s/%s} ", + kinfo_proc_thread_name(kipp)); + + switch (kkstp->kkst_state) { + case KKST_STATE_RUNNING: + xo_emit("{:state/%-29s/%s}\n", "<running>"); + continue; + + case KKST_STATE_SWAPPED: + xo_emit("{:state/%-29s/%s}\n", "<swapped>"); + continue; + + case KKST_STATE_STACKOK: + break; + + default: + xo_emit("{:state/%-29s/%s}\n", "<unknown>"); + continue; + } + + /* + * The kernel generates a trace with carriage returns between + * entries, but for a more compact view, we convert carriage + * returns to spaces. + */ + kstack_cleanup(kkstp->kkst_trace, trace, + (procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1); + xo_open_list("trace"); + kstack_cleanup_encoded(kkstp->kkst_trace, encoded_trace, + (procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1); + xo_close_list("trace"); + xo_emit("{d:trace/%-29s}\n", trace); + } + procstat_freekstack(procstat, kkstp_free); + procstat_freeprocs(procstat, kip_free); +} |