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Message-Id: <20190825132330.5015-6-changbin.du@gmail.com>
Date: Sun, 25 Aug 2019 21:23:24 +0800
From: Changbin Du <changbin.du@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>
Cc: Jonathan Corbet <corbet@....net>, Jessica Yu <jeyu@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org,
Changbin Du <changbin.du@...il.com>
Subject: [PATCH 05/11] ftrace: create memcache for hash entries
When CONFIG_FTRACE_FUNC_PROTOTYPE is enabled, thousands of
ftrace_func_entry instances are created. So create a dedicated
memcache to enhance performance.
Signed-off-by: Changbin Du <changbin.du@...il.com>
---
kernel/trace/ftrace.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index a314f0768b2c..cfcb8dad93ea 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -94,6 +94,8 @@ struct ftrace_ops *function_trace_op __read_mostly = &ftrace_list_end;
/* What to set function_trace_op to */
static struct ftrace_ops *set_function_trace_op;
+struct kmem_cache *hash_entry_cache;
+
static bool ftrace_pids_enabled(struct ftrace_ops *ops)
{
struct trace_array *tr;
@@ -1169,7 +1171,7 @@ static int add_hash_entry(struct ftrace_hash *hash, unsigned long ip,
{
struct ftrace_func_entry *entry;
- entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ entry = kmem_cache_alloc(hash_entry_cache, GFP_KERNEL);
if (!entry)
return -ENOMEM;
@@ -6153,6 +6155,15 @@ void __init ftrace_init(void)
if (ret)
goto failed;
+ hash_entry_cache = kmem_cache_create("ftrace-hash",
+ sizeof(struct ftrace_func_entry),
+ sizeof(struct ftrace_func_entry),
+ 0, NULL);
+ if (!hash_entry_cache) {
+ pr_err("failed to create ftrace hash entry cache\n");
+ goto failed;
+ }
+
count = __stop_mcount_loc - __start_mcount_loc;
if (!count) {
pr_info("ftrace: No functions to be traced?\n");
@@ -6172,6 +6183,10 @@ void __init ftrace_init(void)
return;
failed:
+ if (hash_entry_cache) {
+ kmem_cache_destroy(hash_entry_cache);
+ hash_entry_cache = NULL;
+ }
ftrace_disabled = 1;
}
--
2.20.1
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