perf probe: Allow placing uprobes in alternate namespaces.
Teaches perf how to place a uprobe on a file that's in a different mount namespace. The user must add the probe using the --target-ns argument to perf probe. Once it has been placed, it may be recorded against without further namespace-specific commands. Signed-off-by: Krister Johansen <kjlx@templeofstupid.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> [ PPC build fixed by Ravi: ] Link: http://lkml.kernel.org/r/1500287542-6219-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com Cc: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com> [ Fix !HAVE_DWARF_SUPPORT build ] Link: http://lkml.kernel.org/r/1499305693-1599-4-git-send-email-kjlx@templeofstupid.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Krister Johansen
Arnaldo Carvalho de Melo
parent
bf2e710b3c
commit
544abd44c7
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@ -130,6 +130,11 @@ OPTIONS
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--max-probes=NUM::
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Set the maximum number of probe points for an event. Default is 128.
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--target-ns=PID:
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Obtain mount namespace information from the target pid. This is
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used when creating a uprobe for a process that resides in a
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different mount namespace from the perf(1) utility.
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-x::
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--exec=PATH::
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Specify path to the executable or shared library file for user
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@ -264,6 +269,10 @@ Add probes at malloc() function on libc
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./perf probe -x /lib/libc.so.6 malloc or ./perf probe /lib/libc.so.6 malloc
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Add a uprobe to a target process running in a different mount namespace
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./perf probe --target-ns <target pid> -x /lib64/libc.so.6 malloc
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SEE ALSO
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--------
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linkperf:perf-trace[1], linkperf:perf-record[1], linkperf:perf-buildid-cache[1]
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@ -126,7 +126,7 @@ void arch__post_process_probe_trace_events(struct perf_probe_event *pev,
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struct rb_node *tmp;
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int i = 0;
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map = get_target_map(pev->target, pev->uprobes);
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map = get_target_map(pev->target, pev->nsi, pev->uprobes);
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if (!map || map__load(map) < 0)
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return;
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@ -58,6 +58,7 @@ static struct {
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struct line_range line_range;
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char *target;
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struct strfilter *filter;
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struct nsinfo *nsi;
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} params;
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/* Parse an event definition. Note that any error must die. */
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@ -80,6 +81,9 @@ static int parse_probe_event(const char *str)
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params.target_used = true;
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}
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if (params.nsi)
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pev->nsi = nsinfo__get(params.nsi);
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/* Parse a perf-probe command into event */
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ret = parse_perf_probe_command(str, pev);
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pr_debug("%d arguments\n", pev->nargs);
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@ -189,7 +193,7 @@ static int opt_set_target(const struct option *opt, const char *str,
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/* Expand given path to absolute path, except for modulename */
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if (params.uprobes || strchr(str, '/')) {
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tmp = realpath(str, NULL);
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tmp = nsinfo__realpath(str, params.nsi);
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if (!tmp) {
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pr_warning("Failed to get the absolute path of %s: %m\n", str);
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return ret;
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@ -208,6 +212,34 @@ static int opt_set_target(const struct option *opt, const char *str,
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return ret;
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}
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static int opt_set_target_ns(const struct option *opt __maybe_unused,
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const char *str, int unset __maybe_unused)
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{
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int ret = -ENOENT;
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pid_t ns_pid;
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struct nsinfo *nsip;
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if (str) {
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errno = 0;
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ns_pid = (pid_t)strtol(str, NULL, 10);
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if (errno != 0) {
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ret = -errno;
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pr_warning("Failed to parse %s as a pid: %s\n", str,
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strerror(errno));
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return ret;
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}
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nsip = nsinfo__new(ns_pid);
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if (nsip && nsip->need_setns)
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params.nsi = nsinfo__get(nsip);
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nsinfo__put(nsip);
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ret = 0;
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}
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return ret;
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}
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/* Command option callbacks */
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#ifdef HAVE_DWARF_SUPPORT
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@ -299,6 +331,7 @@ static void cleanup_params(void)
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line_range__clear(¶ms.line_range);
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free(params.target);
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strfilter__delete(params.filter);
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nsinfo__put(params.nsi);
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memset(¶ms, 0, sizeof(params));
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}
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@ -554,6 +587,8 @@ __cmd_probe(int argc, const char **argv)
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OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
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OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
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"Look for files with symbols relative to this directory"),
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OPT_CALLBACK(0, "target-ns", NULL, "pid",
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"target pid for namespace contexts", opt_set_target_ns),
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OPT_END()
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};
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int ret;
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@ -634,15 +669,15 @@ __cmd_probe(int argc, const char **argv)
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pr_err_with_code(" Error: Failed to show event list.", ret);
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return ret;
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case 'F':
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ret = show_available_funcs(params.target, params.filter,
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params.uprobes);
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ret = show_available_funcs(params.target, params.nsi,
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params.filter, params.uprobes);
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if (ret < 0)
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pr_err_with_code(" Error: Failed to show functions.", ret);
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return ret;
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#ifdef HAVE_DWARF_SUPPORT
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case 'L':
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ret = show_line_range(¶ms.line_range, params.target,
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params.uprobes);
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params.nsi, params.uprobes);
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if (ret < 0)
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pr_err_with_code(" Error: Failed to show lines.", ret);
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return ret;
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@ -11,6 +11,7 @@
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#include "event.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <sched.h>
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#include <stdlib.h>
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#include <stdio.h>
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@ -233,3 +234,15 @@ void nsinfo__mountns_exit(struct nscookie *nc)
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nc->newns = -1;
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}
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}
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char *nsinfo__realpath(const char *path, struct nsinfo *nsi)
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{
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char *rpath;
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struct nscookie nsc;
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nsinfo__mountns_enter(nsi, &nsc);
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rpath = realpath(path, NULL);
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nsinfo__mountns_exit(&nsc);
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return rpath;
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}
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@ -49,6 +49,8 @@ void nsinfo__put(struct nsinfo *nsi);
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void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
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void nsinfo__mountns_exit(struct nscookie *nc);
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char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
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static inline void __nsinfo__zput(struct nsinfo **nsip)
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{
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if (nsip) {
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@ -184,13 +184,19 @@ static struct map *kernel_get_module_map(const char *module)
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return NULL;
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}
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struct map *get_target_map(const char *target, bool user)
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struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
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{
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/* Init maps of given executable or kernel */
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if (user)
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return dso__new_map(target);
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else
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if (user) {
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struct map *map;
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map = dso__new_map(target);
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if (map && map->dso)
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map->dso->nsinfo = nsinfo__get(nsi);
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return map;
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} else {
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return kernel_get_module_map(target);
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}
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}
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static int convert_exec_to_group(const char *exec, char **result)
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@ -366,7 +372,8 @@ static int kernel_get_module_dso(const char *module, struct dso **pdso)
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static int find_alternative_probe_point(struct debuginfo *dinfo,
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struct perf_probe_point *pp,
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struct perf_probe_point *result,
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const char *target, bool uprobes)
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const char *target, struct nsinfo *nsi,
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bool uprobes)
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{
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struct map *map = NULL;
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struct symbol *sym;
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@ -377,7 +384,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
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if (!pp->function || pp->file)
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return -ENOTSUP;
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map = get_target_map(target, uprobes);
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map = get_target_map(target, nsi, uprobes);
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if (!map)
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return -EINVAL;
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@ -421,8 +428,8 @@ static int get_alternative_probe_event(struct debuginfo *dinfo,
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memcpy(tmp, &pev->point, sizeof(*tmp));
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memset(&pev->point, 0, sizeof(pev->point));
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ret = find_alternative_probe_point(dinfo, tmp, &pev->point,
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pev->target, pev->uprobes);
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ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target,
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pev->nsi, pev->uprobes);
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if (ret < 0)
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memcpy(&pev->point, tmp, sizeof(*tmp));
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@ -444,7 +451,7 @@ static int get_alternative_line_range(struct debuginfo *dinfo,
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if (lr->end != INT_MAX)
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len = lr->end - lr->start;
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ret = find_alternative_probe_point(dinfo, &pp, &result,
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target, user);
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target, NULL, user);
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if (!ret) {
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lr->function = result.function;
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lr->file = result.file;
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@ -457,12 +464,14 @@ static int get_alternative_line_range(struct debuginfo *dinfo,
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}
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/* Open new debuginfo of given module */
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static struct debuginfo *open_debuginfo(const char *module, bool silent)
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static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
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bool silent)
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{
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const char *path = module;
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char reason[STRERR_BUFSIZE];
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struct debuginfo *ret = NULL;
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struct dso *dso = NULL;
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struct nscookie nsc;
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int err;
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if (!module || !strchr(module, '/')) {
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@ -480,6 +489,7 @@ static struct debuginfo *open_debuginfo(const char *module, bool silent)
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}
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path = dso->long_name;
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}
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nsinfo__mountns_enter(nsi, &nsc);
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ret = debuginfo__new(path);
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if (!ret && !silent) {
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pr_warning("The %s file has no debug information.\n", path);
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@ -489,6 +499,7 @@ static struct debuginfo *open_debuginfo(const char *module, bool silent)
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pr_warning("Rebuild with -g, ");
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pr_warning("or install an appropriate debuginfo package.\n");
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}
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nsinfo__mountns_exit(&nsc);
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return ret;
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}
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@ -516,7 +527,7 @@ static struct debuginfo *debuginfo_cache__open(const char *module, bool silent)
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goto out;
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}
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debuginfo_cache = open_debuginfo(module, silent);
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debuginfo_cache = open_debuginfo(module, NULL, silent);
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if (!debuginfo_cache)
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zfree(&debuginfo_cache_path);
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out:
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@ -531,14 +542,18 @@ static void debuginfo_cache__exit(void)
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}
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static int get_text_start_address(const char *exec, unsigned long *address)
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static int get_text_start_address(const char *exec, unsigned long *address,
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struct nsinfo *nsi)
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{
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Elf *elf;
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GElf_Ehdr ehdr;
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GElf_Shdr shdr;
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int fd, ret = -ENOENT;
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struct nscookie nsc;
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nsinfo__mountns_enter(nsi, &nsc);
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fd = open(exec, O_RDONLY);
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nsinfo__mountns_exit(&nsc);
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if (fd < 0)
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return -errno;
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@ -582,7 +597,7 @@ static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
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ret = -EINVAL;
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goto error;
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}
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ret = get_text_start_address(tp->module, &stext);
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ret = get_text_start_address(tp->module, &stext, NULL);
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if (ret < 0)
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goto error;
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addr += stext;
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@ -659,7 +674,7 @@ post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
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/* Prepare a map for offline binary */
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map = dso__new_map(pathname);
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if (!map || get_text_start_address(pathname, &stext) < 0) {
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if (!map || get_text_start_address(pathname, &stext, NULL) < 0) {
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pr_warning("Failed to get ELF symbols for %s\n", pathname);
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return -EINVAL;
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}
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@ -676,7 +691,8 @@ post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
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}
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static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
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int ntevs, const char *exec)
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int ntevs, const char *exec,
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struct nsinfo *nsi)
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{
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int i, ret = 0;
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unsigned long stext = 0;
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@ -684,7 +700,7 @@ static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
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if (!exec)
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return 0;
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ret = get_text_start_address(exec, &stext);
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ret = get_text_start_address(exec, &stext, nsi);
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if (ret < 0)
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return ret;
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@ -715,7 +731,7 @@ post_process_module_probe_trace_events(struct probe_trace_event *tevs,
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if (!module)
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return 0;
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map = get_target_map(module, false);
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map = get_target_map(module, NULL, false);
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if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) {
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pr_warning("Failed to get ELF symbols for %s\n", module);
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return -EINVAL;
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@ -802,7 +818,8 @@ static int post_process_probe_trace_events(struct perf_probe_event *pev,
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int ret;
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if (uprobe)
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ret = add_exec_to_probe_trace_events(tevs, ntevs, module);
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ret = add_exec_to_probe_trace_events(tevs, ntevs, module,
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pev->nsi);
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else if (module)
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/* Currently ref_reloc_sym based probe is not for drivers */
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ret = post_process_module_probe_trace_events(tevs, ntevs,
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@ -825,7 +842,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
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struct debuginfo *dinfo;
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int ntevs, ret = 0;
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dinfo = open_debuginfo(pev->target, !need_dwarf);
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dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf);
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if (!dinfo) {
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if (need_dwarf)
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return -ENOENT;
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@ -945,7 +962,7 @@ static int __show_line_range(struct line_range *lr, const char *module,
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char sbuf[STRERR_BUFSIZE];
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/* Search a line range */
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dinfo = open_debuginfo(module, false);
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dinfo = open_debuginfo(module, NULL, false);
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if (!dinfo)
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return -ENOENT;
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@ -1021,14 +1038,18 @@ static int __show_line_range(struct line_range *lr, const char *module,
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return ret;
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}
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int show_line_range(struct line_range *lr, const char *module, bool user)
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int show_line_range(struct line_range *lr, const char *module,
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struct nsinfo *nsi, bool user)
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{
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int ret;
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struct nscookie nsc;
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ret = init_probe_symbol_maps(user);
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if (ret < 0)
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return ret;
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nsinfo__mountns_enter(nsi, &nsc);
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ret = __show_line_range(lr, module, user);
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nsinfo__mountns_exit(&nsc);
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exit_probe_symbol_maps();
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return ret;
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@ -1111,7 +1132,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
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if (ret < 0)
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return ret;
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dinfo = open_debuginfo(pevs->target, false);
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dinfo = open_debuginfo(pevs->target, pevs->nsi, false);
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if (!dinfo) {
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ret = -ENOENT;
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goto out;
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@ -1155,6 +1176,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
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int show_line_range(struct line_range *lr __maybe_unused,
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const char *module __maybe_unused,
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struct nsinfo *nsi __maybe_unused,
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bool user __maybe_unused)
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{
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pr_warning("Debuginfo-analysis is not supported.\n");
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@ -2703,6 +2725,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
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struct probe_trace_event *tev = NULL;
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struct probe_cache *cache = NULL;
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struct strlist *namelist[2] = {NULL, NULL};
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struct nscookie nsc;
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up = pev->uprobes ? 1 : 0;
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fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);
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|
|
@ -2729,7 +2752,9 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
|
|||
if (ret < 0)
|
||||
break;
|
||||
|
||||
nsinfo__mountns_enter(pev->nsi, &nsc);
|
||||
ret = probe_file__add_event(fd[up], tev);
|
||||
nsinfo__mountns_exit(&nsc);
|
||||
if (ret < 0)
|
||||
break;
|
||||
|
||||
|
|
@ -2805,7 +2830,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
|
|||
int ret, i, j, skipped = 0;
|
||||
char *mod_name;
|
||||
|
||||
map = get_target_map(pev->target, pev->uprobes);
|
||||
map = get_target_map(pev->target, pev->nsi, pev->uprobes);
|
||||
if (!map) {
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
|
|
@ -3345,13 +3370,16 @@ int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
|||
void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs)
|
||||
{
|
||||
int i, j;
|
||||
struct perf_probe_event *pev;
|
||||
|
||||
/* Loop 3: cleanup and free trace events */
|
||||
for (i = 0; i < npevs; i++) {
|
||||
pev = &pevs[i];
|
||||
for (j = 0; j < pevs[i].ntevs; j++)
|
||||
clear_probe_trace_event(&pevs[i].tevs[j]);
|
||||
zfree(&pevs[i].tevs);
|
||||
pevs[i].ntevs = 0;
|
||||
nsinfo__zput(pev->nsi);
|
||||
clear_perf_probe_event(&pevs[i]);
|
||||
}
|
||||
}
|
||||
|
|
@ -3409,8 +3437,8 @@ int del_perf_probe_events(struct strfilter *filter)
|
|||
return ret;
|
||||
}
|
||||
|
||||
int show_available_funcs(const char *target, struct strfilter *_filter,
|
||||
bool user)
|
||||
int show_available_funcs(const char *target, struct nsinfo *nsi,
|
||||
struct strfilter *_filter, bool user)
|
||||
{
|
||||
struct rb_node *nd;
|
||||
struct map *map;
|
||||
|
|
@ -3421,7 +3449,7 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
|
|||
return ret;
|
||||
|
||||
/* Get a symbol map */
|
||||
map = get_target_map(target, user);
|
||||
map = get_target_map(target, nsi, user);
|
||||
if (!map) {
|
||||
pr_err("Failed to get a map for %s\n", (target) ? : "kernel");
|
||||
return -EINVAL;
|
||||
|
|
|
|||
|
|
@ -4,6 +4,7 @@
|
|||
#include <linux/compiler.h>
|
||||
#include <stdbool.h>
|
||||
#include "intlist.h"
|
||||
#include "namespaces.h"
|
||||
|
||||
/* Probe related configurations */
|
||||
struct probe_conf {
|
||||
|
|
@ -92,6 +93,7 @@ struct perf_probe_event {
|
|||
struct perf_probe_arg *args; /* Arguments */
|
||||
struct probe_trace_event *tevs;
|
||||
int ntevs;
|
||||
struct nsinfo *nsi; /* Target namespace */
|
||||
};
|
||||
|
||||
/* Line range */
|
||||
|
|
@ -163,10 +165,12 @@ int show_perf_probe_event(const char *group, const char *event,
|
|||
struct perf_probe_event *pev,
|
||||
const char *module, bool use_stdout);
|
||||
int show_perf_probe_events(struct strfilter *filter);
|
||||
int show_line_range(struct line_range *lr, const char *module, bool user);
|
||||
int show_line_range(struct line_range *lr, const char *module,
|
||||
struct nsinfo *nsi, bool user);
|
||||
int show_available_vars(struct perf_probe_event *pevs, int npevs,
|
||||
struct strfilter *filter);
|
||||
int show_available_funcs(const char *module, struct strfilter *filter, bool user);
|
||||
int show_available_funcs(const char *module, struct nsinfo *nsi,
|
||||
struct strfilter *filter, bool user);
|
||||
void arch__fix_tev_from_maps(struct perf_probe_event *pev,
|
||||
struct probe_trace_event *tev, struct map *map,
|
||||
struct symbol *sym);
|
||||
|
|
@ -180,7 +184,7 @@ int e_snprintf(char *str, size_t size, const char *format, ...) __printf(3, 4);
|
|||
int copy_to_probe_trace_arg(struct probe_trace_arg *tvar,
|
||||
struct perf_probe_arg *pvar);
|
||||
|
||||
struct map *get_target_map(const char *target, bool user);
|
||||
struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user);
|
||||
|
||||
void arch__post_process_probe_trace_events(struct perf_probe_event *pev,
|
||||
int ntevs);
|
||||
|
|
|
|||
Loading…
Reference in New Issue