[dpdk-dev] [PATCH] eal: warn on --no-huge allocation requirement

[Thomas Monjalon]

18/07/2019 12:18, Burakov, Anatoly:
> On 18-Jul-19 10:34 AM, Thomas Monjalon wrote:
> > When using --no-huge mode, dynamic allocation is not supported.
> > Because of this limitation, the option --legacy-mem is implied
> > and -m may be needed to specify the amount of memory to allocate.
> > Otherwise the default amount MEMSIZE_IF_NO_HUGE_PAGE will be allocated.
> > 
> > Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
> > ---
> >   lib/librte_eal/common/eal_common_options.c | 4 ++++
> >   1 file changed, 4 insertions(+)
> > 
> > diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
> > index 512d5088e..4a76929ea 100644
> > --- a/lib/librte_eal/common/eal_common_options.c
> > +++ b/lib/librte_eal/common/eal_common_options.c
> > @@ -1551,6 +1551,10 @@ eal_check_common_options(struct internal_config *internal_cfg)
> >   			"be specified at the same time\n");
> >   		return -1;
> >   	}
> > +	if (internal_cfg->no_hugetlbfs && internal_cfg->memory == 0) {
> > +		RTE_LOG(NOTICE, EAL, "Option --"OPT_NO_HUGE" uses legacy mode, "
> > +			"option -m would override default memory allocation\n");
> 
> I think this is too technical and misleading. I don't think user cares 
> about legacy vs dynamic mode here. I would rather print out something 
> more informative, like, say, something along those lines:
> 
> "Option --no-huge was specified in command-line arguments. This mode 
> uses static memory layout and will allocate %dMB of memory by default. 
> Option '-m' can be used to increase allocated memory amount."
> 
> where %d is the amount of memory we're preallocating.

%d is defined in eal.c
It requires to move the value in a common .h

I may try something like you suggest in shorter.
A log is supposed to be short :)