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Re: [Xen-devel] [PATCH] memaccess: reduce include dependencies
- To: Jan Beulich <jbeulich@xxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 9 Mar 2020 15:16:58 +0000
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- Cc: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
- Delivery-date: Mon, 09 Mar 2020 15:17:12 +0000
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On 09/03/2020 15:10, Jan Beulich wrote:
> On 09.03.2020 16:07, Tamas K Lengyel wrote:
>> On Mon, Mar 9, 2020 at 5:49 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>> The common header doesn't itself need to include public/vm_event.h nor
>>> public/memory.h. Drop their inclusion. This requires using the non-
>>> typedef names in two prototypes and an inline function; by not changing
>>> the callers and function definitions at the same time it'll remain
>>> certain that the build would fail if the typedef itself was changed.
>> Just curious, what's the benefit of doing this?
> Less dependencies that (almost) every CU gets, and hence statistically
> less rebuilds of (almost) everything when only a rather special purpose
> header file changes.
Also fractionally faster compile times generally (reduced parsing of
unrelated header files), and overall, a reduction in the complexity of
the tangled mess that is our header files.
~Andrew
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