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Date: Mon, 9 Aug 2021 13:17:13 -0400
From: Jonathan Toppins <jtoppins@...hat.com>
To: Joe Perches <joe@...ches.com>, netdev@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>,
Veaceslav Falico <vfalico@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] bonding: combine netlink and console error
messages
On 8/9/21 1:05 AM, Joe Perches wrote:
> On Sun, 2021-08-08 at 22:07 -0400, Jonathan Toppins wrote:
>> On 8/8/21 6:02 AM, Joe Perches wrote:
>>> On Sat, 2021-08-07 at 17:54 -0400, Jonathan Toppins wrote:
>>>> On 8/6/21 11:52 PM, Joe Perches wrote:
>>>>> On Fri, 2021-08-06 at 23:30 -0400, Jonathan Toppins wrote:
>>>>>> There seems to be no reason to have different error messages between
>>>>>> netlink and printk. It also cleans up the function slightly.
>>>>> []
>>>>>> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>>>>> []
>>>>>> +#define BOND_NL_ERR(bond_dev, extack, errmsg) do { \
>>>>>> + NL_SET_ERR_MSG(extack, errmsg); \
>>>>>> + netdev_err(bond_dev, "Error: " errmsg "\n"); \
>>>>>> +} while (0)
>>>>>> +
>>>>>> +#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \
>>>>>> + NL_SET_ERR_MSG(extack, errmsg); \
>>>>>> + slave_err(bond_dev, slave_dev, "Error: " errmsg "\n"); \
>>>>>> +} while (0)
>>>>>
>>>>> If you are doing this, it's probably smaller object code to use
>>>>> "%s", errmsg
>>>>> as the errmsg string can be reused
>>>>>
>>>>> #define BOND_NL_ERR(bond_dev, extack, errmsg) \
>>>>> do { \
>>>>> NL_SET_ERR_MSG(extack, errmsg); \
>>>>> netdev_err(bond_dev, "Error: %s\n", errmsg); \
>>>>> } while (0)
>>>>>
>>>>> #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) \
>>>>> do { \
>>>>> NL_SET_ERR_MSG(extack, errmsg); \
>>>>> slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \
>>>>> } while (0)
>>>>>
>>>>>
>>>>
>>>> I like the thought and would agree if not for how NL_SET_ERR_MSG is
>>>> coded. Unfortunately it does not appear as though doing the above change
>>>> actually generates smaller object code. Maybe I have incorrectly
>>>> interpreted something?
>>>
>>> No, it's because you are compiling allyesconfig or equivalent.
>>> Try defconfig with bonding.
>>>
>>>
>>
>> $ git clean -dxf
>> $ git log -1 -p
>> commit 8985f8d3fa38bca5f5384f9210ed735d58fd94f2 (HEAD ->
>> upstream-bonding-cleanup)
>> Author: Jonathan Toppins <jtoppins@...hat.com>
>> Date: Sun Aug 8 21:45:14 2021 -0400
>>
>> object code optimization
>>
>> diff --git a/drivers/net/bonding/bond_main.c
>> b/drivers/net/bonding/bond_main.c
>> index 46b95175690b..e2903ae7cdab 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -1714,12 +1714,12 @@ void bond_lower_state_changed(struct slave *slave)
>>
>> #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \
>> NL_SET_ERR_MSG(extack, errmsg); \
>> - netdev_err(bond_dev, "Error: " errmsg "\n"); \
>> + netdev_err(bond_dev, "Error: %s\n", errmsg); \
>> } while (0)
>>
>> #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \
>> NL_SET_ERR_MSG(extack, errmsg); \
>> - slave_err(bond_dev, slave_dev, "Error: " errmsg "\n"); \
>> + slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \
>> } while (0)
>>
>> /* enslave device <slave> to bond device <master> */
>> $ git log --oneline -2
>> 8985f8d3fa38 (HEAD -> upstream-bonding-cleanup) object code optimization
>> e326bf8fd30f bonding: combine netlink and console error messages
>> $ make defconfig
>> HOSTCC scripts/basic/fixdep
>> [...]
>> *** Default configuration is based on 'x86_64_defconfig'
>> #
>> # configuration written to .config
>> #
>> $ grep "BONDING" .config
>> # CONFIG_BONDING is not set
>> $ make menuconfig
>> UPD scripts/kconfig/mconf-cfg
>> [...]
>> configuration written to .config
>>
>> *** End of the configuration.
>> *** Execute 'make' to start the build or try 'make help'.
>>
>> $ grep "BONDING" .config
>> CONFIG_BONDING=m
>> $ git rebase -i --exec "make drivers/net/bonding/bond_main.o; ls -l
>> drivers/net/bonding/bond_main.o" HEAD^^
>> Executing: make drivers/net/bonding/bond_main.o; ls -l
>> drivers/net/bonding/bond_main.o
>> SYNC include/config/auto.conf.cmd
>> [...]
>> CC /home/jtoppins/projects/linux-rhel7/tools/objtool/librbtree.o
>> LD /home/jtoppins/projects/linux-rhel7/tools/objtool/objtool-in.o
>> LINK /home/jtoppins/projects/linux-rhel7/tools/objtool/objtool
>> CC [M] drivers/net/bonding/bond_main.o
>> -rw-r--r--. 1 jtoppins jtoppins 131800 Aug 8 21:47
>> drivers/net/bonding/bond_main.o
>> Executing: make drivers/net/bonding/bond_main.o; ls -l
>> drivers/net/bonding/bond_main.o
>> CALL scripts/checksyscalls.sh
>> CALL scripts/atomic/check-atomics.sh
>> DESCEND objtool
>> CC [M] drivers/net/bonding/bond_main.o
>> -rw-r--r--. 1 jtoppins jtoppins 131928 Aug 8 21:47
>
> Your size is significantly different than mine (x86-64 defconfig w/ bonding)
>
> $ gcc --version
> gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0
> Copyright (C) 2020 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> Original:
>
> $ git log -1
> commit 7999516e20bd9bb5d1f7351cbd05ca529a3a8d60 (HEAD, tag: next-20210806, origin/master, origin/HEAD)
> Author: Mark Brown <broonie@...nel.org>
> Date: Fri Aug 6 17:52:53 2021 +0100
>
> Add linux-next specific files for 20210806
>
> Signed-off-by: Mark Brown <broonie@...nel.org>
>
> $ size drivers/net/bonding/built-in.a -t
> text data bss dec hex filename
> 59630 399 460 60489 ec49 drivers/net/bonding/bond_main.o (ex drivers/net/bonding/built-in.a)
> 16790 14 2 16806 41a6 drivers/net/bonding/bond_3ad.o (ex drivers/net/bonding/built-in.a)
> 17101 50 0 17151 42ff drivers/net/bonding/bond_alb.o (ex drivers/net/bonding/built-in.a)
> 7116 1516 0 8632 21b8 drivers/net/bonding/bond_sysfs.o (ex drivers/net/bonding/built-in.a)
> 1411 72 0 1483 5cb drivers/net/bonding/bond_sysfs_slave.o (ex drivers/net/bonding/built-in.a)
> 165 0 0 165 a5 drivers/net/bonding/bond_debugfs.o (ex drivers/net/bonding/built-in.a)
> 6971 232 0 7203 1c23 drivers/net/bonding/bond_netlink.o (ex drivers/net/bonding/built-in.a)
> 15889 74 0 15963 3e5b drivers/net/bonding/bond_options.o (ex drivers/net/bonding/built-in.a)
> 4769 0 0 4769 12a1 drivers/net/bonding/bond_procfs.o (ex drivers/net/bonding/built-in.a)
> 129842 2357 462 132661 20635 (TOTALS)
>
> Then with your 2 patches:
>
> $ size -t drivers/net/bonding/built-in.a
> text data bss dec hex filename
> 59590 399 460 60449 ec21 drivers/net/bonding/bond_main.o (ex drivers/net/bonding/built-in.a)
> 16790 14 2 16806 41a6 drivers/net/bonding/bond_3ad.o (ex drivers/net/bonding/built-in.a)
> 17101 50 0 17151 42ff drivers/net/bonding/bond_alb.o (ex drivers/net/bonding/built-in.a)
> 7116 1516 0 8632 21b8 drivers/net/bonding/bond_sysfs.o (ex drivers/net/bonding/built-in.a)
> 1411 72 0 1483 5cb drivers/net/bonding/bond_sysfs_slave.o (ex drivers/net/bonding/built-in.a)
> 165 0 0 165 a5 drivers/net/bonding/bond_debugfs.o (ex drivers/net/bonding/built-in.a)
> 6971 232 0 7203 1c23 drivers/net/bonding/bond_netlink.o (ex drivers/net/bonding/built-in.a)
> 15889 74 0 15963 3e5b drivers/net/bonding/bond_options.o (ex drivers/net/bonding/built-in.a)
> 4769 0 0 4769 12a1 drivers/net/bonding/bond_procfs.o (ex drivers/net/bonding/built-in.a)
> 129802 2357 462 132621 2060d (TOTALS)
>
> Then with my suggestion:
>
> $ size -t drivers/net/bonding/built-in.a
> text data bss dec hex filename
> 59561 399 460 60420 ec04 drivers/net/bonding/bond_main.o (ex drivers/net/bonding/built-in.a)
> 16790 14 2 16806 41a6 drivers/net/bonding/bond_3ad.o (ex drivers/net/bonding/built-in.a)
> 17101 50 0 17151 42ff drivers/net/bonding/bond_alb.o (ex drivers/net/bonding/built-in.a)
> 7116 1516 0 8632 21b8 drivers/net/bonding/bond_sysfs.o (ex drivers/net/bonding/built-in.a)
> 1411 72 0 1483 5cb drivers/net/bonding/bond_sysfs_slave.o (ex drivers/net/bonding/built-in.a)
> 165 0 0 165 a5 drivers/net/bonding/bond_debugfs.o (ex drivers/net/bonding/built-in.a)
> 6971 232 0 7203 1c23 drivers/net/bonding/bond_netlink.o (ex drivers/net/bonding/built-in.a)
> 15889 74 0 15963 3e5b drivers/net/bonding/bond_options.o (ex drivers/net/bonding/built-in.a)
> 4769 0 0 4769 12a1 drivers/net/bonding/bond_procfs.o (ex drivers/net/bonding/built-in.a)
> 129773 2357 462 132592 205f0 (TOTALS)
>
> cheers, Joe
>
Humm I was just building the .o of the one compilation unit. I wonder if
there is further optimization later. Will post a v2 with yours and
Leon's changes later this evening.
Appreciate the suggestions.
-Jon
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