From: Bruce Richardson <bruce.richardson@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, Ma Lihong <lihongx.ma@intel.com>,
Hemant Agrawal <hemant.agrawal@nxp.com>
Subject: Re: [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants
Date: Fri, 16 Oct 2020 16:55:58 +0100 [thread overview]
Message-ID: <20201016155558.GB1121@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <CAJFAV8zP0+Ge5JE+N_8TwVxoPwXBJWcJBtshToqh-=NicAp+yw@mail.gmail.com>
On Fri, Oct 16, 2020 at 05:47:45PM +0200, David Marchand wrote:
> Hello Bruce,
>
> On Thu, Sep 3, 2020 at 4:50 PM Bruce Richardson
> <bruce.richardson@intel.com> wrote:
> >
> > A number of the more advanced DPDK build settings which are not expected to
> > be user modified are stored in config/rte_config.h. In some cases, for a
> > custom build a user may want to override those settings via CFLAGS, so we
> > need to ensure that the definitions do not override the user-provided
> > values.
> >
> > Bruce Richardson (3):
> > config: remove explicit undefinition of unset values
> > config: allow overriding some build defaults
> > doc: add notes on overriding extra config values
>
> $ CFLAGS="-DRTE_MAX_MEMSEG_LISTS=64" meson setup
> --default-library=shared --buildtype=debugoptimized
> -Dprefix=/home/dmarchan/git/pub/dpdk.org/build/install build
> $ ninja-build -C build -j4 install
>
>
> librte_eal.so is indeed built with the 64 value:
> $ pahole -C rte_mem_config build/install/lib64/librte_eal.so |grep memsegs
> die__process_function: tag not supported (INVALID)!
> struct rte_memseg_list memsegs[64]; /* 136 8704 */
>
>
> But no trace of the custom value for external applications:
> $ grep -r RTE_MAX_MEMSEG_LISTS build/install
> build/install/include/rte_config.h:#ifndef RTE_MAX_MEMSEG_LISTS
> build/install/include/rte_config.h:#define RTE_MAX_MEMSEG_LISTS 128
> Binary file build/install/lib64/librte_eal.a matches
> Binary file build/install/lib64/librte_eal.so.21.0 matches
>
> I can see the same using the meson option -Dc_args.
>
Good point, I had not thought of external apps using these values.
They are mostly for internal use, so maybe its worthwhile looking to not
have them in a public header file. What do you think? Is it likely that
apps would be using some of these values, or needs to know the specifics?
/Bruce
next prev parent reply other threads:[~2020-10-16 16:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 11:44 [dpdk-dev] [PATCH 1/2] config: remove explicit undefinition of unset values Bruce Richardson
2020-08-25 11:44 ` [dpdk-dev] [PATCH 2/2] config: allow overriding some build defaults Bruce Richardson
2020-09-01 5:17 ` Ma, LihongX
2020-09-01 6:07 ` Hemant Agrawal
2020-09-01 9:02 ` Bruce Richardson
2020-09-03 14:50 ` Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 1/3] config: remove explicit undefinition of unset values Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 2/3] config: allow overriding some build defaults Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 3/3] doc: add notes on overriding extra config values Bruce Richardson
2020-09-03 15:43 ` Hemant Agrawal
2020-10-14 14:20 ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-10-15 8:55 ` Chen, BoX C
2020-10-15 9:20 ` Bruce Richardson
2020-10-16 15:47 ` David Marchand
2020-10-16 15:55 ` Bruce Richardson [this message]
2020-10-16 16:46 ` David Marchand
2020-10-19 10:21 ` Bruce Richardson
2020-10-19 21:04 ` Thomas Monjalon
2020-10-20 8:34 ` Bruce Richardson
2020-10-20 10:04 ` Thomas Monjalon
2020-10-20 10:15 ` Bruce Richardson
2020-10-28 16:32 ` Bruce Richardson
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