From: Petr Mladek <pmladek@suse.com>
To: Zhen Lei <thunder.leizhen@huawei.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>,
Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
Joe Lawrence <joe.lawrence@redhat.com>,
live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
Masahiro Yamada <masahiroy@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Luis Chamberlain <mcgrof@kernel.org>,
linux-modules@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
David Laight <David.Laight@aculab.com>
Subject: Re: [PATCH v8 6/9] livepatch: Use kallsyms_on_each_match_symbol() to improve performance
Date: Wed, 23 Nov 2022 14:28:24 +0100 [thread overview]
Message-ID: <Y34f+IqqSGbtC82V@alley> (raw)
In-Reply-To: <20221102084921.1615-7-thunder.leizhen@huawei.com>
Hi,
I am sorry for the late review. I have been snowed under another
tasks.
On Wed 2022-11-02 16:49:18, Zhen Lei wrote:
> Based on the test results of kallsyms_on_each_match_symbol() and
> kallsyms_on_each_symbol(), the average performance can be improved by
> more than 1500 times.
Sounds great.
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -153,6 +153,24 @@ static int klp_find_callback(void *data, const char *name,
> return 0;
> }
>
> +static int klp_match_callback(void *data, unsigned long addr)
> +{
> + struct klp_find_arg *args = data;
> +
> + args->addr = addr;
> + args->count++;
> +
> + /*
> + * Finish the search when the symbol is found for the desired position
> + * or the position is not defined for a non-unique symbol.
> + */
> + if ((args->pos && (args->count == args->pos)) ||
> + (!args->pos && (args->count > 1)))
> + return 1;
> +
> + return 0;
This duplicates most of the klp_find_callback(). Please, call this
new function in klp_find_callback() instead of the duplicated code.
I mean to do:
static int klp_find_callback(void *data, const char *name, unsigned long addr)
{
struct klp_find_arg *args = data;
if (strcmp(args->name, name))
return 0;
return klp_match_callback(data, addr);
}
Otherwise, it looks good.
Best Regards,
Petr
next prev parent reply other threads:[~2022-11-23 13:41 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-02 8:49 [PATCH v8 0/9] kallsyms: Optimizes the performance of lookup symbols Zhen Lei
2022-11-02 8:49 ` [PATCH v8 1/9] scripts/kallsyms: rename build_initial_tok_table() Zhen Lei
2022-11-02 8:49 ` [PATCH v8 2/9] kallsyms: Improve the performance of kallsyms_lookup_name() Zhen Lei
2022-11-02 8:49 ` [PATCH v8 3/9] kallsyms: Correctly sequence symbols when CONFIG_LTO_CLANG=y Zhen Lei
2022-11-02 8:49 ` [PATCH v8 4/9] kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[] Zhen Lei
2022-11-02 12:00 ` David Laight
2022-11-07 8:01 ` Leizhen (ThunderTown)
2022-11-02 8:49 ` [PATCH v8 5/9] kallsyms: Add helper kallsyms_on_each_match_symbol() Zhen Lei
2022-11-02 8:49 ` [PATCH v8 6/9] livepatch: Use kallsyms_on_each_match_symbol() to improve performance Zhen Lei
2022-11-23 13:28 ` Petr Mladek [this message]
2022-11-24 2:36 ` Leizhen (ThunderTown)
2022-11-24 8:29 ` Petr Mladek
2022-12-06 22:08 ` Luis Chamberlain
2022-12-07 1:30 ` Leizhen (ThunderTown)
2022-11-02 8:49 ` [PATCH v8 7/9] livepatch: Improve the search performance of module_kallsyms_on_each_symbol() Zhen Lei
2022-11-14 7:47 ` Jiri Olsa
2022-11-14 8:50 ` Leizhen (ThunderTown)
2022-11-14 9:27 ` Jiri Olsa
2022-11-14 10:00 ` Leizhen (ThunderTown)
2022-11-14 10:31 ` Jiri Olsa
2022-11-14 11:30 ` Leizhen (ThunderTown)
2022-11-14 13:26 ` Jiri Olsa
2022-11-14 15:46 ` Luis Chamberlain
2022-11-15 2:10 ` Leizhen (ThunderTown)
2022-11-15 7:30 ` Jiri Olsa
2022-11-15 7:54 ` Luis Chamberlain
2022-11-15 8:14 ` Leizhen (ThunderTown)
2022-11-15 20:11 ` Stephen Rothwell
2022-11-23 13:57 ` Petr Mladek
2022-11-24 2:41 ` Leizhen (ThunderTown)
2022-11-02 8:49 ` [PATCH v8 8/9] kallsyms: Delete an unused parameter related to kallsyms_on_each_symbol() Zhen Lei
2022-11-02 8:49 ` [PATCH v8 9/9] kallsyms: Add self-test facility Zhen Lei
2022-11-13 2:44 ` [PATCH v8 0/9] kallsyms: Optimizes the performance of lookup symbols Luis Chamberlain
2022-11-13 2:55 ` Luis Chamberlain
2022-11-14 1:25 ` Leizhen (ThunderTown)
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