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[
    {
        "id": 116306,
        "web_url": "https://patches.dpdk.org/comment/116306/",
        "msgid": "<fbd9c539-24c1-8cd8-988f-56dd423f892d@partner.samsung.com>",
        "date": "2020-07-20T12:51:56",
        "subject": "Re: [dpdk-dev] [PATCH] service: fix stop API to wait for service\n\tthread",
        "submitter": {
            "id": 1628,
            "url": "https://patches.dpdk.org/api/people/1628/",
            "name": "Lukasz Wojciechowski",
            "email": "l.wojciechow@partner.samsung.com"
        },
        "content": "W dniu 20.07.2020 o 14:09, Harry van Haaren pisze:\n> This commit improves the service_lcore_stop() implementation,\n> waiting for the service core in question to return. The service\n> thread itself now has a variable to indicate if its thread is\n> active. When zero the service thread has completed its service,\n> and has returned from the service_runner_func() function.\n>\n> This fixes a race condition observed in the DPDK CI, where the\n> statistics of the service were not consistent with the expectation\n> due to the service thread still running, and incrementing a stat\n> after stop was called.\n>\n> Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>\n>\n> ---\n>\n> This is one possible solution, that avoids a class of race-conditions\n> based on stop() api and following behaviours. Without a change in\n> implementation of the service core thread, we could not detect when\n> the thread was actually finished. This is now possible, and the stop\n> api makes use of it to wait for 1000x one millisecond, or log a warning\n> that a service core didn't return quickly.\n>\n> Thanks for the discussion/debug on list - I'm not sure how to add\n> reported-by/suggested-by etc tags: but I'll resend a V2 (or can add\n> on apply).\n>\n> ---\n>   lib/librte_eal/common/rte_service.c | 24 ++++++++++++++++++++++++\n>   1 file changed, 24 insertions(+)\n>\n> diff --git a/lib/librte_eal/common/rte_service.c b/lib/librte_eal/common/rte_service.c\n> index 6a0e0ff65..d2255587d 100644\n> --- a/lib/librte_eal/common/rte_service.c\n> +++ b/lib/librte_eal/common/rte_service.c\n> @@ -65,6 +65,7 @@ struct core_state {\n>   \t/* map of services IDs are run on this core */\n>   \tuint64_t service_mask;\n>   \tuint8_t runstate; /* running or stopped */\n> +\tuint8_t thread_active; /* indicates when the thread is in service_run() */\n>   \tuint8_t is_service_core; /* set if core is currently a service core */\n>   \tuint8_t service_active_on_lcore[RTE_SERVICE_NUM_MAX];\n>   \tuint64_t loops;\n> @@ -457,6 +458,8 @@ service_runner_func(void *arg)\n>   \tconst int lcore = rte_lcore_id();\n>   \tstruct core_state *cs = &lcore_states[lcore];\n>   \n> +\t__atomic_store_n(&cs->thread_active, 1, __ATOMIC_RELAXED);\n> +\n>   \t/* runstate act as the guard variable. Use load-acquire\n>   \t * memory order here to synchronize with store-release\n>   \t * in runstate update functions.\n> @@ -475,6 +478,7 @@ service_runner_func(void *arg)\n>   \t\tcs->loops++;\n>   \t}\n>   \n> +\t__atomic_store_n(&cs->thread_active, 0, __ATOMIC_RELAXED);\n>   \treturn 0;\n>   }\n>   \n> @@ -765,6 +769,26 @@ rte_service_lcore_stop(uint32_t lcore)\n>   \t__atomic_store_n(&lcore_states[lcore].runstate, RUNSTATE_STOPPED,\n>   \t\t__ATOMIC_RELEASE);\n>   \n> +\t/* wait for service lcore to return */\n> +\ti = 0;\n> +\tuint8_t active;\n> +\tuint64_t start = rte_rdtsc();\n> +\tdo {\n> +\t\tactive = __atomic_load_n(&lcore_states[lcore].thread_active,\n> +\t\t\t\t\t __ATOMIC_RELAXED);\n> +\t\tif (active == 0)\n> +\t\t\tbreak;\n> +\t\trte_delay_ms(1);\n> +\t\ti++;\n> +\t} while (i < 1000);\n> +\n> +\tif (active != 0) {\n> +\t\tuint64_t end = rte_rdtsc();\n> +\t\tRTE_LOG(WARNING, EAL,\n> +\t\t\t\"service lcore stop() failed, waited for %ld cycles\\n\",\n> +\t\t\tend - start);\n> +\t}\n> +\n>   \treturn 0;\n>   }\n>   \nI don't like the idea of inserting this polling loop inside API call. \nAnd I don't like setting up a 1000 iterations constraint.\nHow about keeping the thread_active flag, but moving checking state of \nthis flag to separate function. This way the user of the API would be \nable to write own loop.\nMaybe he/she would like a custom loop, because:\n* waiting for more cores\n* would like to wait longer\n* would like to check if service is finished less often...",
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            "Subject": "Re: [dpdk-dev] [PATCH] service: fix stop API to wait for service\n\tthread",
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            "Date": "Mon, 20 Jul 2020 14:51:56 +0200",
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            "To": "Harry van Haaren <harry.van.haaren@intel.com>, dev@dpdk.org",
            "From": "Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>",
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            "Cc": "david.marchand@redhat.com, igor.romanov@oktetlabs.ru,\n honnappa.nagarahalli@arm.com, ferruh.yigit@intel.com, nd@arm.com,\n aconole@redhat.com",
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    },
    {
        "id": 116314,
        "web_url": "https://patches.dpdk.org/comment/116314/",
        "msgid": "<BYAPR11MB31434ED0846748546D905F86D77B0@BYAPR11MB3143.namprd11.prod.outlook.com>",
        "date": "2020-07-20T14:20:22",
        "subject": "Re: [dpdk-dev] [PATCH] service: fix stop API to wait for service\n\tthread",
        "submitter": {
            "id": 317,
            "url": "https://patches.dpdk.org/api/people/317/",
            "name": "Van Haaren, Harry",
            "email": "harry.van.haaren@intel.com"
        },
        "content": "> -----Original Message-----\n> From: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>\n> Sent: Monday, July 20, 2020 1:52 PM\n> To: Van Haaren, Harry <harry.van.haaren@intel.com>; dev@dpdk.org\n> Cc: david.marchand@redhat.com; igor.romanov@oktetlabs.ru;\n> honnappa.nagarahalli@arm.com; Yigit, Ferruh <ferruh.yigit@intel.com>;\n> nd@arm.com; aconole@redhat.com\n> Subject: Re: [PATCH] service: fix stop API to wait for service thread\n> \n> \n> W dniu 20.07.2020 o 14:09, Harry van Haaren pisze:\n> > This commit improves the service_lcore_stop() implementation,\n> > waiting for the service core in question to return. The service\n> > thread itself now has a variable to indicate if its thread is\n> > active. When zero the service thread has completed its service,\n> > and has returned from the service_runner_func() function.\n> >\n> > This fixes a race condition observed in the DPDK CI, where the\n> > statistics of the service were not consistent with the expectation\n> > due to the service thread still running, and incrementing a stat\n> > after stop was called.\n> >\n> > Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>\n> >\n> > ---\n> >\n> > This is one possible solution, that avoids a class of race-conditions\n> > based on stop() api and following behaviours. Without a change in\n> > implementation of the service core thread, we could not detect when\n> > the thread was actually finished. This is now possible, and the stop\n> > api makes use of it to wait for 1000x one millisecond, or log a warning\n> > that a service core didn't return quickly.\n> >\n> > Thanks for the discussion/debug on list - I'm not sure how to add\n> > reported-by/suggested-by etc tags: but I'll resend a V2 (or can add\n> > on apply).\n> >\n> > ---\n> >   lib/librte_eal/common/rte_service.c | 24 ++++++++++++++++++++++++\n> >   1 file changed, 24 insertions(+)\n> >\n> > diff --git a/lib/librte_eal/common/rte_service.c\n> b/lib/librte_eal/common/rte_service.c\n> > index 6a0e0ff65..d2255587d 100644\n> > --- a/lib/librte_eal/common/rte_service.c\n> > +++ b/lib/librte_eal/common/rte_service.c\n> > @@ -65,6 +65,7 @@ struct core_state {\n> >   \t/* map of services IDs are run on this core */\n> >   \tuint64_t service_mask;\n> >   \tuint8_t runstate; /* running or stopped */\n> > +\tuint8_t thread_active; /* indicates when the thread is in service_run() */\n> >   \tuint8_t is_service_core; /* set if core is currently a service core */\n> >   \tuint8_t service_active_on_lcore[RTE_SERVICE_NUM_MAX];\n> >   \tuint64_t loops;\n> > @@ -457,6 +458,8 @@ service_runner_func(void *arg)\n> >   \tconst int lcore = rte_lcore_id();\n> >   \tstruct core_state *cs = &lcore_states[lcore];\n> >\n> > +\t__atomic_store_n(&cs->thread_active, 1, __ATOMIC_RELAXED);\n> > +\n> >   \t/* runstate act as the guard variable. Use load-acquire\n> >   \t * memory order here to synchronize with store-release\n> >   \t * in runstate update functions.\n> > @@ -475,6 +478,7 @@ service_runner_func(void *arg)\n> >   \t\tcs->loops++;\n> >   \t}\n> >\n> > +\t__atomic_store_n(&cs->thread_active, 0, __ATOMIC_RELAXED);\n> >   \treturn 0;\n> >   }\n> >\n> > @@ -765,6 +769,26 @@ rte_service_lcore_stop(uint32_t lcore)\n> >   \t__atomic_store_n(&lcore_states[lcore].runstate, RUNSTATE_STOPPED,\n> >   \t\t__ATOMIC_RELEASE);\n> >\n> > +\t/* wait for service lcore to return */\n> > +\ti = 0;\n> > +\tuint8_t active;\n> > +\tuint64_t start = rte_rdtsc();\n> > +\tdo {\n> > +\t\tactive = __atomic_load_n(&lcore_states[lcore].thread_active,\n> > +\t\t\t\t\t __ATOMIC_RELAXED);\n> > +\t\tif (active == 0)\n> > +\t\t\tbreak;\n> > +\t\trte_delay_ms(1);\n> > +\t\ti++;\n> > +\t} while (i < 1000);\n> > +\n> > +\tif (active != 0) {\n> > +\t\tuint64_t end = rte_rdtsc();\n> > +\t\tRTE_LOG(WARNING, EAL,\n> > +\t\t\t\"service lcore stop() failed, waited for %ld cycles\\n\",\n> > +\t\t\tend - start);\n> > +\t}\n> > +\n> >   \treturn 0;\n> >   }\n> >\n> I don't like the idea of inserting this polling loop inside API call.\n> And I don't like setting up a 1000 iterations constraint.\n> How about keeping the thread_active flag, but moving checking state of\n> this flag to separate function. This way the user of the API would be\n> able to write own loop.\n> Maybe he/she would like a custom loop, because:\n> * waiting for more cores\n> * would like to wait longer\n> * would like to check if service is finished less often...\n\nAgree - good feedback, thanks. v2 on the way, with this approach.",
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            "Subject": "Re: [dpdk-dev] [PATCH] service: fix stop API to wait for service\n\tthread",
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            "From": "\"Van Haaren, Harry\" <harry.van.haaren@intel.com>",
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