From: tip-bot for Ian Munsie <imunsie@au1.ibm.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com,
rostedt@goodmis.org, tglx@linutronix.de, imunsie@au1.ibm.com
Subject: [tip:perf/core] tracing/syscalls: Early terminate search for sys_ni_syscall
Date: Thu, 17 Feb 2011 15:00:17 GMT [thread overview]
Message-ID: <tip-ae07f551c42d6e4162436ca452a199deac9dab4d@git.kernel.org> (raw)
In-Reply-To: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com>
Commit-ID: ae07f551c42d6e4162436ca452a199deac9dab4d
Gitweb: http://git.kernel.org/tip/ae07f551c42d6e4162436ca452a199deac9dab4d
Author: Ian Munsie <imunsie@au1.ibm.com>
AuthorDate: Thu, 3 Feb 2011 14:27:25 +1100
Committer: Steven Rostedt <rostedt@goodmis.org>
CommitDate: Mon, 7 Feb 2011 21:30:14 -0500
tracing/syscalls: Early terminate search for sys_ni_syscall
Many system calls are unimplemented and mapped to sys_ni_syscall, but at
boot ftrace would still search through every syscall metadata entry for
a match which wouldn't be there.
This patch adds causes the search to terminate early if the system call
is not mapped.
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace_syscalls.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 86a23e7..ee7b5a0 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -85,6 +85,9 @@ find_syscall_meta(unsigned long syscall)
stop = __stop_syscalls_metadata;
kallsyms_lookup(syscall, NULL, NULL, NULL, str);
+ if (arch_syscall_match_sym_name(str, "sys_ni_syscall"))
+ return NULL;
+
for ( ; start < stop; start++) {
if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
return *start;
next prev parent reply other threads:[~2011-02-17 15:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 3:27 PowerPC, ftrace: Add PPC raw syscall tracepoints & ftrace fixes (mimimal subset only) v4 Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-03 3:27 ` [PATCH 1/6] ftrace syscalls: don't add events for unmapped syscalls Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-17 14:58 ` [tip:perf/core] tracing/syscalls: Don't " tip-bot for Ian Munsie
2011-02-03 3:27 ` [PATCH 2/6] ftrace syscalls: Convert redundant syscall_nr checks into WARN_ON Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-17 14:59 ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03 3:27 ` [PATCH 3/6] ftrace syscalls: Make arch_syscall_addr weak Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-17 14:59 ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03 3:27 ` [PATCH 4/6] ftrace syscalls: Allow arch specific syscall symbol matching Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-17 14:59 ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03 3:27 ` [PATCH 5/6] ftrace, powerpc: Implement raw syscall tracepoints on PowerPC Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-08 2:10 ` Steven Rostedt
2011-02-08 2:10 ` Steven Rostedt
2011-02-08 10:07 ` Benjamin Herrenschmidt
2011-02-08 10:07 ` Benjamin Herrenschmidt
2011-02-08 16:54 ` Steven Rostedt
2011-02-08 16:54 ` Steven Rostedt
2011-02-03 3:27 ` [PATCH 6/6] ftrace syscalls: Early terminate search for sys_ni_syscall Ian Munsie
2011-02-03 3:27 ` Ian Munsie
2011-02-17 15:00 ` tip-bot for Ian Munsie [this message]
2011-02-08 2:10 ` PowerPC, ftrace: Add PPC raw syscall tracepoints & ftrace fixes (mimimal subset only) v4 Steven Rostedt
2011-02-08 2:10 ` Steven Rostedt
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