linux-kernel - [RFT PATCH 04/13] kprobes: Make optimizer delay to 1 second

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Message-Id: <157918589199.29301.4419459150054220408.stgit@devnote2>
Date:   Thu, 16 Jan 2020 23:44:52 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Brendan Gregg <brendan.d.gregg@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     mhiramat@...nel.org, Ingo Molnar <mingo@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        "David S . Miller" <davem@...emloft.net>, paulmck@...nel.org,
        joel@...lfernandes.org,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
Subject: [RFT PATCH 04/13] kprobes: Make optimizer delay to 1 second

Since the 5 jiffies delay for the optimizer is too
short to wait for other probes, make it longer,
like 1 second.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 kernel/kprobes.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 0dacdcecc90f..9c6e230852ad 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -469,7 +469,8 @@ static int kprobe_optimizer_queue_update;
 
 static void kprobe_optimizer(struct work_struct *work);
 static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer);
-#define OPTIMIZE_DELAY 5
+/* Wait 1 second for starting optimization */
+#define OPTIMIZE_DELAY HZ
 
 /*
  * Optimize (replace a breakpoint with a jump) kprobes listed on