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Subject[PATCH 08/12] perf: export some syscall metadata
Date
Create and export a list of syscall_nr:syscall_name pairs from the
data in the syscalls_metadata, for use initially by perf trace.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
---
kernel/trace/trace_syscalls.c | 87 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 87 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index f6b0712..e037486 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -626,5 +626,92 @@ void prof_sysexit_disable(struct ftrace_event_call *call)
mutex_unlock(&syscall_trace_lock);
}

+struct syscall_metadata **meta_skip(struct syscall_metadata **meta,
+ loff_t *pos)
+{
+ struct syscall_metadata **end = syscalls_metadata + NR_syscalls;
+
+ do {
+ meta++;
+ (*pos)++;
+ } while (meta < end && *meta == NULL);
+
+ if (meta >= end)
+ meta = NULL;
+
+ return meta;
+}
+
+static void *syscall_map_start(struct seq_file *s, loff_t *pos)
+{
+ struct syscall_metadata **end = syscalls_metadata + NR_syscalls;
+ struct syscall_metadata **meta = syscalls_metadata + *pos;
+
+ if (meta >= end)
+ return NULL;
+
+ if (*meta == NULL)
+ meta = meta_skip(meta, pos);
+
+ return meta;
+}
+
+static void *syscall_map_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ (*pos)++;
+
+ return syscall_map_start(s, pos);
+}
+
+static int syscall_map_show(struct seq_file *s, void *v)
+{
+ const struct syscall_metadata **meta = v;
+ const struct syscall_metadata *m = *meta;
+
+ seq_printf(s, "%d:", m->syscall_nr);
+ seq_printf(s, "%s\n", m->name);
+
+ return 0;
+}
+
+static void syscall_map_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations show_syscall_map_seq_ops = {
+ .start = syscall_map_start,
+ .next = syscall_map_next,
+ .show = syscall_map_show,
+ .stop = syscall_map_stop,
+};
+
+static int syscall_map_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &show_syscall_map_seq_ops);
+}
+
+static const struct file_operations syscall_map_fops = {
+ .open = syscall_map_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static __init int init_syscall_map(void)
+{
+ struct dentry *d_tracer;
+
+ d_tracer = tracing_init_dentry();
+ if (!d_tracer)
+ return 0;
+
+ trace_create_file("syscall_map", 0444, d_tracer,
+ NULL, &syscall_map_fops);
+
+ return 0;
+}
+
+fs_initcall(init_syscall_map);
+
#endif /* CONFIG_PERF_EVENTS */

--
1.6.4.GIT


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