#undef _GNU_SOURCE #include #include #include /* * The tools so far have been using the strerror_r() GNU variant, that returns * a string, be it the buffer passed or something else. * * But that, besides being tricky in cases where we expect that the function * using strerror_r() returns the error formatted in a provided buffer (we have * to check if it returned something else and copy that instead), breaks the * build on systems not using glibc, like Alpine Linux, where musl libc is * used. * * So, introduce yet another wrapper, str_error_r(), that has the GNU * interface, but uses the portable XSI variant of strerror_r(), so that users * rest asured that the provided buffer is used and it is what is returned. */ char *str_error_r(int errnum, char *buf, size_t buflen) { int err = strerror_r(errnum, buf, buflen); if (err) snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err); return buf; } e-cleanup net-next plumbingsTobias Klauser
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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /tools/perf/ui/util.h
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/ui/util.h')