#include #include #include "tests.h" #include "debug.h" #include "util.h" #include "perf-hooks.h" static void sigsegv_handler(int sig __maybe_unused) { pr_debug("SIGSEGV is observed as expected, try to recover.\n"); perf_hooks__recover(); signal(SIGSEGV, SIG_DFL); raise(SIGSEGV); exit(-1); } static void the_hook(void *_hook_flags) { int *hook_flags = _hook_flags; int *p = NULL; *hook_flags = 1234; /* Generate a segfault, test perf_hooks__recover */ *p = 0; } int test__perf_hooks(int subtest __maybe_unused) { int hook_flags = 0; signal(SIGSEGV, sigsegv_handler); perf_hooks__set_hook("test", the_hook, &hook_flags); perf_hooks__invoke_test(); /* hook is triggered? */ if (hook_flags != 1234) { pr_debug("Setting failed: %d (%p)\n", hook_flags, &hook_flags); return TEST_FAIL; } /* the buggy hook is removed? */ if (perf_hooks__get_hook("test")) return TEST_FAIL; return TEST_OK; } elect name='h' onchange='this.form.submit();'> net-next plumbingsTobias Klauser
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ctp?h=nds-private-remove&id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /net/sctp
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 'net/sctp')