linux-kernel - Re: [PATCH net-next v2] lib: Allow for the DIM library to be modular

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Date: Tue, 7 May 2024 10:08:19 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: netdev@...r.kernel.org, kuba@...nel.org, jgg@...dia.com,
 leonro@...dia.com, horms@...nel.org,
 Andrew Morton <akpm@...ux-foundation.org>, Tal Gilboa <talgi@...dia.com>,
 "open list:LIBRARY CODE" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] lib: Allow for the DIM library to be modular

On 5/7/24 06:13, Alexander Lobakin wrote:
> From: Florian Fainelli <florian.fainelli@...adcom.com>
> Date: Mon,  6 May 2024 10:50:40 -0700
> 
>> Allow the Dynamic Interrupt Moderation (DIM) library to be built as a
>> module. This is particularly useful in an Android GKI (Google Kernel
>> Image) configuration where everything is built as a module, including
>> Ethernet controller drivers. Having to build DIMLIB into the kernel
>> image with potentially no user is wasteful.
> 
> Some bloat-o-meter -c vmlinux.{before,after} would be good to have here.
> The library is small, but I personally would like to see it modular.

/scripts/bloat-o-meter vmlinux vmlinux.after
add/remove: 1/16 grow/shrink: 0/0 up/down: 8/-1980 (-1972)
Function                                     old     new   delta
e843419@...0_00005048_4014                     -       8      +8
e843419@...3_000055c6_5944                     8       -      -8
dim_park_on_top                                8       -      -8
dim_park_tired                                16       -     -16
net_dim_get_def_tx_moderation                 24       -     -24
net_dim_get_def_rx_moderation                 24       -     -24
dim_turn                                      52       -     -52
net_dim_get_rx_moderation                     60       -     -60
net_dim_get_tx_moderation                     64       -     -64
tx_profile                                    80       -     -80
rx_profile                                    80       -     -80
dim_on_top                                    84       -     -84
net_dim_step                                 132       -    -132
dim_calc_stats                               172       -    -172
net_dim_stats_compare                        176       -    -176
net_dim                                      464       -    -464
rdma_dim                                     536       -    -536
Total: Before=12668884, After=12666912, chg -0.02%

This is on arm64 FWIW.

> 
>>
>> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
> 
> Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> 
>> ---
>> Changes in v2:
>>
>> - Added MODULE_DESCRIPTION()
>>
>>   lib/Kconfig      | 2 +-
>>   lib/dim/Makefile | 4 ++--
>>   lib/dim/dim.c    | 3 +++
>>   3 files changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/Kconfig b/lib/Kconfig
>> index 4557bb8a5256..d33a268bc256 100644
>> --- a/lib/Kconfig
>> +++ b/lib/Kconfig
>> @@ -628,7 +628,7 @@ config SIGNATURE
>>   	  Implementation is done using GnuPG MPI library
>>   
>>   config DIMLIB
>> -	bool
>> +	tristate
>>   	help
>>   	  Dynamic Interrupt Moderation library.
>>   	  Implements an algorithm for dynamically changing CQ moderation values
>> diff --git a/lib/dim/Makefile b/lib/dim/Makefile
>> index 1d6858a108cb..c4cc4026c451 100644
>> --- a/lib/dim/Makefile
>> +++ b/lib/dim/Makefile
>> @@ -2,6 +2,6 @@
>>   # DIM Dynamic Interrupt Moderation library
>>   #
>>   
>> -obj-$(CONFIG_DIMLIB) += dim.o
>> +obj-$(CONFIG_DIMLIB) += dimlib.o
> 
> I guess you renamed it due to that there's already a module named 'dim'?

This is required to avoid the follow recursive dependency:

make[4]: Circular lib/dim/dim.o <- lib/dim/dim.o dependency dropped.
-- 
Florian


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