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perf namespaces: Add 'in_pidns' to nsinfo struct
Provides an accurate mean to determine if the owner thread is in a different PID namespace. Signed-off-by: Yonatan Goldschmidt <yonatan.goldschmidt@granulate.io> Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: https://lore.kernel.org/r/20201105015418.1725218-1-yonatan.goldschmidt@granulate.io Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
committed by
Arnaldo Carvalho de Melo
parent
473f742e18
commit
2b51c71be5
@@ -66,6 +66,7 @@ int nsinfo__init(struct nsinfo *nsi)
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char spath[PATH_MAX];
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char *newns = NULL;
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char *statln = NULL;
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char *nspid;
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struct stat old_stat;
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struct stat new_stat;
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FILE *f = NULL;
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@@ -112,8 +113,12 @@ int nsinfo__init(struct nsinfo *nsi)
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}
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if (strstr(statln, "NStgid:") != NULL) {
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nsi->nstgid = (pid_t)strtol(strrchr(statln, '\t'),
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NULL, 10);
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nspid = strrchr(statln, '\t');
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nsi->nstgid = (pid_t)strtol(nspid, NULL, 10);
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/* If innermost tgid is not the first, process is in a different
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* PID namespace.
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*/
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nsi->in_pidns = (statln + sizeof("NStgid:") - 1) != nspid;
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break;
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}
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}
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@@ -140,6 +145,7 @@ struct nsinfo *nsinfo__new(pid_t pid)
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nsi->tgid = pid;
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nsi->nstgid = pid;
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nsi->need_setns = false;
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nsi->in_pidns = false;
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/* Init may fail if the process exits while we're trying to look
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* at its proc information. In that case, save the pid but
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* don't try to enter the namespace.
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@@ -166,6 +172,7 @@ struct nsinfo *nsinfo__copy(struct nsinfo *nsi)
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nnsi->tgid = nsi->tgid;
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nnsi->nstgid = nsi->nstgid;
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nnsi->need_setns = nsi->need_setns;
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nnsi->in_pidns = nsi->in_pidns;
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if (nsi->mntns_path) {
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nnsi->mntns_path = strdup(nsi->mntns_path);
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if (!nnsi->mntns_path) {
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@@ -33,6 +33,7 @@ struct nsinfo {
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pid_t tgid;
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pid_t nstgid;
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bool need_setns;
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bool in_pidns;
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char *mntns_path;
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refcount_t refcnt;
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};
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