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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9058 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 9/6/2024 11:04 AM, Morten Brørup wrote: >> From: Ferruh Yigit [mailto:ferruh.yigit@amd.com] >> Sent: Friday, 6 September 2024 10.54 >> >> On 9/5/2024 3:01 PM, Jerin Jacob wrote: >>> On Thu, Sep 5, 2024 at 3:14 PM Morten Brørup >> wrote: >>>> >>>>> From: David Marchand [mailto:david.marchand@redhat.com] >>>>> Sent: Thursday, 5 September 2024 11.03 >>>>> >>>>> On Thu, Sep 5, 2024 at 10:55 AM Morten Brørup >>>>> wrote: >>>>>> >>>>>>> From: David Marchand [mailto:david.marchand@redhat.com] >>>>>>> Sent: Thursday, 5 September 2024 09.59 >>>>>>> >>>>>>> On Wed, Sep 4, 2024 at 8:10 PM Stephen Hemminger >>>>>>> wrote: >>>>>>>> >>>>>>>> The API's in ethtool from before 23.11 should be marked stable. >>>>>>> >>>>>>> EAL* ? >>>>>>> >>>>>>>> Should probably include the trace api's but that is more complex >> change. >>>>>>> >>>>>>> On the trace API itself it should be ok. >>>>>> >>>>>> No! >>>>> >>>>> *sigh* >>>>> >>>>>> >>>>>> Trace must remain experimental until controlled by a meson option, e.g. >>>>> "enable_trace", whereby trace can be completely disabled and omitted from >> the >>>>> compiled application/libraries/drivers at build time. >>>>> >>>>> This seems unrelated to marking the API stable as regardless of the >>>>> API state at the moment, this code is always present. >>>> >>>> I cannot foresee if disabling trace at build time will require changes to >> the trace API. So I'm being cautious here. >>>> >>>> However, if Jerin (as author of the trace subsystem) foresees that it will >> be possible to disable trace at build time without affecting the trace API, I >> don't object to marking the trace API (or some of it) stable. >>> >>> I don't for foresee any ABI changes when adding disabling trace >>> compile time support. However, I don't understand why we need to do >>> that. In the sense, fast path functions are already having an option >>> to compile out. >>> Slow path functions can be disabled at runtime at the cost of 1 cycle >>> as instrumentation cost. Having said that, I don't have any concern >>> about disabling trace as an option. >>> >> >> I agree with Jerin, I don't see motivation to disable slow path traces >> when they can be disabled in runtime. >> And fast path traces already have compile flag to disable them. >> >> Build time configurations in long term has problems too, so I am for not >> using them unless we don't have to. > > For some use cases, trace is dead code, and should be omitted. > You don't want dead code in production systems. > > Please remember that DPDK is also being used in highly optimized embedded systems, hardware appliances and other systems where memory is not abundant. > > DPDK is not only for cloud and distros. ;-) > > The CI only tests DPDK with a build time configuration expected to be usable for distros. > I'm not asking to change that. > I'm only asking for more build time configurability to support other use cases. > I see, but that build time configuration argument exists in multiple aspects. And with meson switch we lean to dynamic configuration approach. When a build time config introduced, again and again we are having cases that specific code enabled with compile time macro broken and nobody noticed. Having code enabled always and configured in runtime produces more robust deliverable. We are aware that DPDK is used in embedded device, but they are not mostly very resource restricted devices, is it really matter to have a few megabytes (I didn't check but I expect this the max binary size can increase with tracing code) larger DPDK binary, does it really makes any difference?