/* * Copyright 2014, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #ifndef _SELFTESTS_POWERPC_PMU_EBB_TRACE_H #define _SELFTESTS_POWERPC_PMU_EBB_TRACE_H #include "utils.h" #define TRACE_TYPE_REG 1 #define TRACE_TYPE_COUNTER 2 #define TRACE_TYPE_STRING 3 #define TRACE_TYPE_INDENT 4 #define TRACE_TYPE_OUTDENT 5 struct trace_entry { u8 type; u8 length; u8 data[0]; }; struct trace_buffer { u64 size; bool overflow; void *tail; u8 data[0]; }; struct trace_buffer *trace_buffer_allocate(u64 size); int trace_log_reg(struct trace_buffer *tb, u64 reg, u64 value); int trace_log_counter(struct trace_buffer *tb, u64 value); int trace_log_string(struct trace_buffer *tb, char *str); int trace_log_indent(struct trace_buffer *tb); int trace_log_outdent(struct trace_buffer *tb); void trace_buffer_print(struct trace_buffer *tb); void trace_print_location(struct trace_buffer *tb); #endif /* _SELFTESTS_POWERPC_PMU_EBB_TRACE_H */ 48c8b79c321e4a1f31f98194e4f6b6cae7'/> 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/build/tests/ex/empty2/README
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/build/tests/ex/empty2/README')