From: Luis Chamberlain <mcgrof@kernel.org>
To: Zhen Lei <thunder.leizhen@huawei.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>,
Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
Petr Mladek <pmladek@suse.com>,
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>,
linux-modules@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH v7 00/11] kallsyms: Optimizes the performance of lookup symbols
Date: Wed, 19 Oct 2022 05:01:22 -0700 [thread overview]
Message-ID: <Y0/nEngJF6bbINEx@bombadil.infradead.org> (raw)
In-Reply-To: <20221017064950.2038-1-thunder.leizhen@huawei.com>
On Mon, Oct 17, 2022 at 02:49:39PM +0800, Zhen Lei wrote:
> Currently, to search for a symbol, we need to expand the symbols in
> 'kallsyms_names' one by one, and then use the expanded string for
> comparison. This is very slow.
>
> In fact, we can first compress the name being looked up and then use
> it for comparison when traversing 'kallsyms_names'.
>
> This patch series optimizes the performance of function kallsyms_lookup_name(),
> and function klp_find_object_symbol() in the livepatch module. Based on the
> test results, the performance overhead is reduced to 5%. That is, the
> performance of these functions is improved by 20 times.
Stupid question, is a hash table in order?
Luis
next prev parent reply other threads:[~2022-10-19 12:42 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-17 6:49 [PATCH v7 00/11] kallsyms: Optimizes the performance of lookup symbols Zhen Lei
2022-10-17 6:49 ` [PATCH v7 01/11] scripts/kallsyms: rename build_initial_tok_table() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 02/11] scripts/kallsyms: don't compress symbol types Zhen Lei
2022-10-17 6:49 ` [PATCH v7 03/11] scripts/kallsyms: remove helper sym_name() and cleanup Zhen Lei
2022-10-17 6:49 ` [PATCH v7 04/11] kallsyms: Add helper kallsyms_compress_symbol_name() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 05/11] kallsyms: Improve the performance of kallsyms_lookup_name() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 06/11] kallsyms: Improve the performance of kallsyms_lookup_name() when CONFIG_LTO_CLANG=y Zhen Lei
2022-10-17 6:49 ` [PATCH v7 07/11] kallsyms: Add helper kallsyms_on_each_match_symbol() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 08/11] livepatch: Use kallsyms_on_each_match_symbol() to improve performance Zhen Lei
2022-10-17 6:49 ` [PATCH v7 09/11] livepatch: Improve the search performance of module_kallsyms_on_each_symbol() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 10/11] kallsyms: Delete an unused parameter related to kallsyms_on_each_symbol() Zhen Lei
2022-10-17 6:49 ` [PATCH v7 11/11] kallsyms: Add self-test facility Zhen Lei
2022-10-18 8:21 ` kernel test robot
2022-10-18 9:11 ` Leizhen (ThunderTown)
[not found] ` <202210181740.PAAHM5dR-lkp@intel.com>
2022-10-19 8:39 ` Leizhen (ThunderTown)
2022-10-21 2:00 ` kernel test robot
2022-10-19 12:01 ` Luis Chamberlain [this message]
2022-10-19 14:11 ` [PATCH v7 00/11] kallsyms: Optimizes the performance of lookup symbols Leizhen (ThunderTown)
2022-10-25 17:53 ` Luis Chamberlain
2022-10-26 6:44 ` Leizhen (ThunderTown)
2022-10-26 19:03 ` Luis Chamberlain
2022-10-27 3:26 ` Leizhen (ThunderTown)
2022-10-27 6:27 ` Leizhen (ThunderTown)
2022-10-29 8:10 ` Leizhen (ThunderTown)
2022-10-29 12:49 ` David Laight
2022-10-31 2:55 ` Leizhen (ThunderTown)
2022-10-31 4:55 ` Leizhen (ThunderTown)
2022-10-31 15:04 ` Leizhen (ThunderTown)
2022-11-02 9:18 ` Leizhen (ThunderTown)
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