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From: David Marchand <david.marchand@redhat.com>
To: Sunil Kumar Kori <skori@marvell.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Subject: Re: [dpdk-dev] [EXT] [PATCH v2 2/4] trace: remove size limit on CTF event description
Date: Thu, 29 Oct 2020 11:02:43 +0100	[thread overview]
Message-ID: <CAJFAV8yrUFVHO3=qf3wmhertw1YNrSSd-aFmz17ygq+N0C-+cg@mail.gmail.com> (raw)
In-Reply-To: <CY4PR18MB162238C7486FE89ED29160BBB4140@CY4PR18MB1622.namprd18.prod.outlook.com>

On Thu, Oct 29, 2020 at 10:36 AM Sunil Kumar Kori <skori@marvell.com> wrote:
> Yes but I am not able to understand that how tp->ctf_field will be populated with latest memory
> because RTE_PER_LCORE(ctf_field) is being free and re-allocated at runtime.

Initially, RTE_PER_LCORE(ctf_field) is NULL.

Then registration for a trace point happens:

__rte_trace_point_register() calls register_fn() which for each field
in the trace point calls __rte_trace_point_emit_field().

Each call to __rte_trace_point_emit_field accumulates the previous
ctf_field with the new field.

        rc = asprintf(&field, "%s        %s %s;\n",
                RTE_PER_LCORE(ctf_field) != NULL ?
                        RTE_PER_LCORE(ctf_field) : "",
                datatype, in);
        free(RTE_PER_LCORE(ctf_field));
        RTE_PER_LCORE(ctf_field) = field;

Here, RTE_PER_LCORE(ctf_field) is != NULL.

Back to __rte_trace_point_register:

        /* Copy the accumulated fields description and clear it for the next
         * trace point.
         */
        tp->ctf_field = RTE_PER_LCORE(ctf_field);

Once stored, RTE_PER_LCORE(ctf_field) is cleared again for the next
trace point registration.

        RTE_PER_LCORE(ctf_field) = NULL;



-- 
David Marchand


  reply	other threads:[~2020-10-29 10:03 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-23  8:00 [dpdk-dev] [PATCH 0/3] Rework CTF event description storage David Marchand
2020-10-23  8:00 ` [dpdk-dev] [PATCH 1/3] trace: fixup CTF event description at registration David Marchand
2020-10-23  8:00 ` [dpdk-dev] [PATCH 2/3] trace: remove size limit on CTF event description David Marchand
2020-10-28  9:06   ` Jerin Jacob
2020-10-23  8:00 ` [dpdk-dev] [PATCH 3/3] trace: make CTF metadata prettier David Marchand
2020-10-27 19:43 ` [dpdk-dev] [PATCH 0/3] Rework CTF event description storage David Marchand
2020-10-28  8:52   ` Jerin Jacob
2020-10-28 13:09     ` David Marchand
2020-10-28 15:17       ` David Marchand
2020-10-28 15:59         ` David Marchand
2020-10-28 21:02 ` [dpdk-dev] [PATCH v2 0/4] " David Marchand
2020-10-28 21:02   ` [dpdk-dev] [PATCH v2 1/4] trace: fixup CTF event description at registration David Marchand
2020-10-29  8:35     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-10-28 21:02   ` [dpdk-dev] [PATCH v2 2/4] trace: remove size limit on CTF event description David Marchand
2020-10-29  8:41     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-10-29  8:51       ` David Marchand
2020-10-29  9:36         ` Sunil Kumar Kori
2020-10-29 10:02           ` David Marchand [this message]
2020-10-29 10:31             ` Sunil Kumar Kori
2020-10-28 21:02   ` [dpdk-dev] [PATCH v2 3/4] trace: fix metadata dump David Marchand
2020-10-29  8:36     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-10-28 21:02   ` [dpdk-dev] [PATCH v2 4/4] trace: make CTF metadata prettier David Marchand
2020-10-29  8:37     ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2020-10-29 21:50   ` [dpdk-dev] [PATCH v2 0/4] Rework CTF event description storage David Marchand

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