From 467ec08567483e3868f240b1ee03808970e06388 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Wed, 13 Aug 2014 16:12:50 +0000 Subject: [PATCH] perf probe: Fix --del option to delete events only with uprobe events Current perf probe --del doesn't work if only CONFIG_UPROBE_EVENTS=y because it aborts when it fails to open kprobe_events file before checking uprobe_events file. This fixes --del option to delete dynamic events if it can open either kprobe_events or uprobe_events. Only if it failed to open both of them, it shows an error message and aborts. Without this patch, if we run perf probe -d on the kernel configured with CONFIG_KPROBE_EVENTS=n and CONFIG_UPROBE_EVENTS=y, # perf probe -d \* kprobe_events file does not exist - please rebuild kernel with CONFIG_KPROBE_EVENTS. Error: Failed to delete events. With this patch, # perf probe -d \* Removed event: probe_perf:alloc_event Changes in v2: - Use strerror_r instead of strerror. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Naohiro Aota Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20140813161250.26440.24028.stgit@kbuild-fedora.novalocal Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 49 +++++++++++++++++++---------------- 1 file changed, 26 insertions(+), 23 deletions(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 50aa7f05ceb1..443225cb62f7 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -1803,6 +1803,23 @@ static void print_open_warning(int err, bool is_kprobe) strerror_r(-err, sbuf, sizeof(sbuf))); } +static void print_both_open_warning(int kerr, int uerr) +{ + /* Both kprobes and uprobes are disabled, warn it. */ + if (kerr == -ENOTSUP && uerr == -ENOTSUP) + pr_warning("Debugfs is not mounted.\n"); + else if (kerr == -ENOENT && uerr == -ENOENT) + pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS " + "or/and CONFIG_UPROBE_EVENTS.\n"); + else { + char sbuf[128]; + pr_warning("Failed to open kprobe events: %s.\n", + strerror_r(-kerr, sbuf, sizeof(sbuf))); + pr_warning("Failed to open uprobe events: %s.\n", + strerror_r(-uerr, sbuf, sizeof(sbuf))); + } +} + static int open_probe_events(const char *trace_file, bool readwrite) { char buf[PATH_MAX]; @@ -1960,20 +1977,7 @@ int show_perf_probe_events(void) up_fd = open_uprobe_events(false); if (kp_fd < 0 && up_fd < 0) { - /* Both kprobes and uprobes are disabled, warn it. */ - if (kp_fd == -ENOTSUP && up_fd == -ENOTSUP) - pr_warning("Debugfs is not mounted.\n"); - else if (kp_fd == -ENOENT && up_fd == -ENOENT) - pr_warning("Please rebuild kernel with " - "CONFIG_KPROBE_EVENTS or/and " - "CONFIG_UPROBE_EVENTS.\n"); - else { - char sbuf[128]; - pr_warning("Failed to open kprobe events: %s.\n", - strerror_r(-kp_fd, sbuf, sizeof(sbuf))); - pr_warning("Failed to open uprobe events: %s.\n", - strerror_r(-up_fd, sbuf, sizeof(sbuf))); - } + print_both_open_warning(kp_fd, up_fd); ret = kp_fd; goto out; } @@ -2474,19 +2478,18 @@ int del_perf_probe_events(struct strlist *dellist) /* Get current event names */ kfd = open_kprobe_events(true); - if (kfd < 0) { - print_open_warning(kfd, true); - return kfd; - } + if (kfd >= 0) + namelist = get_probe_trace_event_names(kfd, true); - namelist = get_probe_trace_event_names(kfd, true); ufd = open_uprobe_events(true); - - if (ufd < 0) - print_open_warning(ufd, false); - else + if (ufd >= 0) unamelist = get_probe_trace_event_names(ufd, true); + if (kfd < 0 && ufd < 0) { + print_both_open_warning(kfd, ufd); + goto error; + } + if (namelist == NULL && unamelist == NULL) goto error; -- 2.34.1