All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Van Haaren, Harry" <harry.van.haaren@intel.com>
To: David Marchand <david.marchand@6wind.com>,
	Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [PATCH v6] eal: add function to check if primary proc alive
Date: Tue, 8 Mar 2016 13:57:49 +0000	[thread overview]
Message-ID: <E923DB57A917B54B9182A2E928D00FA612889999@IRSMSX102.ger.corp.intel.com> (raw)
In-Reply-To: <CALwxeUuiPa9_fo-51x96RDcUfAhWE1EcPeEZAKE2QLmNtwTAJw@mail.gmail.com>

> From: David Marchand [mailto:david.marchand@6wind.com]
> >> The issue is that if a secondary process is initialized, it holds a read
> >> lock on  /var/run/.rte_config  and this prevents a primary from starting.
> >
> > The new function is advertised as a monitoring feature.
> > But it seems to be also a workaround for an ordering issue when starting
> > primary and secondary processes concurrently, right?
> 
> +1

You are correct, the function rte_eal_primary_proc_alive() added here is
for monitoring if there is a primary process alive.

The rte_eal_mcfg_complete() function call in rte_eal_init() is delayed
to avoid a race-condition between secondary and primary processes.
This race-condition occurs when two processes probe the PCI devices
at the same time.

Delaying the rte_eal_mcfg_complete() call until after the primary has
finished rte_eal_pci_probe() ensures that this race condition is avoided.

-Harry

  reply	other threads:[~2016-03-08 13:57 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-20 13:25 [PATCH] eal: add function to check if primary proc alive Harry van Haaren
2016-01-21  6:14 ` Qiu, Michael
2016-01-21  6:19   ` Matthew Hall
2016-01-21  9:02   ` Van Haaren, Harry
2016-01-22 17:37     ` Bruce Richardson
2016-01-25  8:06       ` Qiu, Michael
2016-01-25 11:44       ` Van Haaren, Harry
2016-01-26 19:13         ` Bruce Richardson
2016-01-27 10:35           ` Van Haaren, Harry
2016-01-25  8:11 ` Qiu, Michael
2016-01-25 11:51   ` Van Haaren, Harry
2016-01-26  2:25     ` Qiu, Michael
2016-01-26  9:04       ` Van Haaren, Harry
2016-01-26 11:07         ` Qiu, Michael
2016-01-26 11:19           ` Van Haaren, Harry
2016-01-27 10:31 ` [PATCH v2] " Harry van Haaren
2016-02-02 14:11   ` [PATCH v3] " Harry van Haaren
2016-02-23 14:10     ` [PATCH v4] " Harry van Haaren
2016-02-24 13:50       ` Tahhan, Maryam
2016-03-04 18:07       ` Thomas Monjalon
2016-03-07 11:37       ` [PATCH v5] " Harry van Haaren
2016-03-07 12:02         ` [PATCH v6] " Harry van Haaren
2016-03-08  8:42           ` David Marchand
2016-03-08  9:58             ` Van Haaren, Harry
2016-03-08 11:13               ` Thomas Monjalon
2016-03-08 11:19                 ` David Marchand
2016-03-08 13:57                   ` Van Haaren, Harry [this message]
2016-03-08 14:40                     ` David Marchand
2016-03-08 17:07           ` [PATCH v7 0/2] eal: add function to check primary alive Harry van Haaren
2016-03-08 17:07             ` [PATCH v7 1/2] eal: fix race-condition in pri/sec proc startup Harry van Haaren
2016-03-08 17:07             ` [PATCH v7 2/2] eal: add function to check if primary proc alive Harry van Haaren
2016-03-09 10:12             ` [PATCH v8 0/2] eal: add function to check primary alive Harry van Haaren
2016-03-09 10:12               ` [PATCH v8 1/2] eal: fix race-condition in pri/sec proc startup Harry van Haaren
2016-03-09 13:23                 ` Sergio Gonzalez Monroy
2016-03-09 10:12               ` [PATCH v8 2/2] eal: add function to check if primary proc alive Harry van Haaren
2016-03-09 11:07               ` [PATCH v8 0/2] eal: add function to check primary alive David Marchand
2016-03-09 12:59                 ` Sergio Gonzalez Monroy
2016-03-09 13:37               ` [PATCH v9 " Harry van Haaren
2016-03-09 13:37                 ` [PATCH v9 1/2] eal: fix race-condition in pri/sec proc startup Harry van Haaren
2016-03-09 14:27                   ` Sergio Gonzalez Monroy
2016-03-09 13:37                 ` [PATCH v9 2/2] eal: add function to check if primary proc alive Harry van Haaren
2016-03-09 15:02                   ` Thomas Monjalon
2016-03-09 15:17                 ` [PATCH v9 0/2] eal: add function to check primary alive Thomas Monjalon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=E923DB57A917B54B9182A2E928D00FA612889999@IRSMSX102.ger.corp.intel.com \
    --to=harry.van.haaren@intel.com \
    --cc=david.marchand@6wind.com \
    --cc=dev@dpdk.org \
    --cc=thomas.monjalon@6wind.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.