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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-02-05 19:14:13 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-06 01:01:41 +0100
commit51a763dd84253bab1d0a1e68e11a7753d1b702ca (patch)
tree2cc2cf0509db480391c585786285267e360c1338 /kernel/trace/trace_selftest.c
parentring_buffer: remove unused flags parameter (diff)
downloadlinux-51a763dd84253bab1d0a1e68e11a7753d1b702ca.tar.xz
linux-51a763dd84253bab1d0a1e68e11a7753d1b702ca.zip
tracing: Introduce trace_buffer_{lock_reserve,unlock_commit}
Impact: new API These new functions do what previously was being open coded, reducing the number of details ftrace plugin writers have to worry about. It also standardizes the handling of stacktrace, userstacktrace and other trace options we may introduce in the future. With this patch, for instance, the blk tracer (and some others already in the tree) can use the "userstacktrace" /d/tracing/trace_options facility. $ codiff /tmp/vmlinux.before /tmp/vmlinux.after linux-2.6-tip/kernel/trace/trace.c: trace_vprintk | -5 trace_graph_return | -22 trace_graph_entry | -26 trace_function | -45 __ftrace_trace_stack | -27 ftrace_trace_userstack | -29 tracing_sched_switch_trace | -66 tracing_stop | +1 trace_seq_to_user | -1 ftrace_trace_special | -63 ftrace_special | +1 tracing_sched_wakeup_trace | -70 tracing_reset_online_cpus | -1 13 functions changed, 2 bytes added, 355 bytes removed, diff: -353 linux-2.6-tip/block/blktrace.c: __blk_add_trace | -58 1 function changed, 58 bytes removed, diff: -58 linux-2.6-tip/kernel/trace/trace.c: trace_buffer_lock_reserve | +88 trace_buffer_unlock_commit | +86 2 functions changed, 174 bytes added, diff: +174 /tmp/vmlinux.after: 16 functions changed, 176 bytes added, 413 bytes removed, diff: -237 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Frédéric Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_selftest.c')
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