linux-kernel - [RFC PATCH 21/32] function_graph: Expand the max reserved data size

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Message-Id: <169920064470.482486.9772883857059976420.stgit@devnote2>
Date:   Mon,  6 Nov 2023 01:10:45 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Florent Revest <revest@...omium.org>
Cc:     linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Guo Ren <guoren@...nel.org>
Subject: [RFC PATCH 21/32] function_graph: Expand the max reserved data size

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Expand the maximum reserved data size to 32 from 4. On 64bit system,
this will allow reserving 256 bytes on the ret_stack in maximum but
that may not happen.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 kernel/trace/fgraph.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 0b8a1daef733..e7188c67356e 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -95,7 +95,7 @@ enum {
 #define FGRAPH_ARRAY_MASK	((1 << FGRAPH_ARRAY_SIZE) - 1)
 #define FGRAPH_ARRAY_SHIFT	(FGRAPH_TYPE_SHIFT + FGRAPH_TYPE_SIZE)
 
-#define FGRAPH_DATA_SIZE	2
+#define FGRAPH_DATA_SIZE	5
 #define FGRAPH_DATA_MASK	((1 << FGRAPH_DATA_SIZE) - 1)
 #define FGRAPH_DATA_SHIFT	(FGRAPH_TYPE_SHIFT + FGRAPH_TYPE_SIZE)
 
@@ -113,7 +113,7 @@ enum {
 
 #define RET_STACK(t, index) ((struct ftrace_ret_stack *)(&(t)->ret_stack[index]))
 
-#define FGRAPH_MAX_DATA_SIZE (sizeof(long) * 4)
+#define FGRAPH_MAX_DATA_SIZE (sizeof(long) * (1 << FGRAPH_DATA_SIZE))
 
 /*
  * Each fgraph_ops has a reservered unsigned long at the end (top) of the