From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>,
Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
Cc: dev@dpdk.org, rsanford@akamai.com, david.marchand@redhat.com
Subject: Re: [dpdk-dev] [PATCH v3] timer: fix resource leak in finalize
Date: Wed, 5 Jun 2019 10:47:27 +0100 [thread overview]
Message-ID: <6fa30d88-c266-5864-8aee-171a2e61d37e@intel.com> (raw)
In-Reply-To: <4234840.t272voWUu0@xps>
On 05-Jun-19 10:33 AM, Thomas Monjalon wrote:
> 09/05/2019 10:29, Burakov, Anatoly:
>> On 08-May-19 11:35 PM, Erik Gabriel Carrillo wrote:
>>> By using a lock added to the rte_mem_config (which lives in shared
>>> memory), we can synchronize multiple processes in init/finalize and
>>> safely free allocations made during init.
>>>
>>> Signed-off-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
>>> ---
>>> changes in v3:
>>> - The previous version had race condition. This version fixes the race
>>> by adding a lock in shared memory outside of the DPDK heap area
>>> that can be used to safely free the memzone reserved in the subsystem
>>> init call. (Anatoly)
>>>
>>> This patch depends on http://patches.dpdk.org/patch/53333/.
>>>
>>> changes in v2:
>>> - Handle scenario where primary process exits before secondaries such
>>> that memzone is not freed early (Anatoly)
>>>
>>> lib/librte_eal/common/include/rte_eal_memconfig.h | 3 +++
>>> lib/librte_timer/rte_timer.c | 23 ++++++++++++++++++++++-
>>> 2 files changed, 25 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/lib/librte_eal/common/include/rte_eal_memconfig.h b/lib/librte_eal/common/include/rte_eal_memconfig.h
>>> index 84aabe3..8cbc09c 100644
>>> --- a/lib/librte_eal/common/include/rte_eal_memconfig.h
>>> +++ b/lib/librte_eal/common/include/rte_eal_memconfig.h
>>> @@ -64,6 +64,9 @@ struct rte_mem_config {
>>> rte_rwlock_t memory_hotplug_lock;
>>> /**< indicates whether memory hotplug request is in progress. */
>>>
>>> + rte_spinlock_t timer_subsystem_lock;
>>> + /**< indicates whether timer subsystem init/finalize is in progress. */
>>> +
>>
>> I believe there's an initialize function somewhere which will initialize
>> all of these locks. This lock should be in there as well.
>>
>> Other than that, i'm OK with this change, however i feel like /just/
>> adding this would be a missed opportunity, because next time we want to
>> add something here it will be an ABI break again.
>>
>> We could perhaps use this opportunity to leave some padding for future
>> data. I'm not sure how would that look like, just an idea floating in my
>> head :)
>
> Any update or other opinion?
>
I have a patchset that hides mem config - if we are to add a lock, it
would be after adding that patch, as a bugfix (since by then it would n
longer be an ABI breakage or an API change).
--
Thanks,
Anatoly
next prev parent reply other threads:[~2019-06-05 9:47 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-01 19:00 [dpdk-dev] [PATCH] " Erik Gabriel Carrillo
2019-05-01 19:00 ` Erik Gabriel Carrillo
2019-05-02 9:18 ` Burakov, Anatoly
2019-05-02 9:18 ` Burakov, Anatoly
2019-05-02 12:19 ` Carrillo, Erik G
2019-05-02 12:19 ` Carrillo, Erik G
2019-05-02 13:03 ` Burakov, Anatoly
2019-05-02 13:03 ` Burakov, Anatoly
2019-05-02 13:48 ` Carrillo, Erik G
2019-05-02 13:48 ` Carrillo, Erik G
2019-05-03 22:54 ` [dpdk-dev] [PATCH v2] " Erik Gabriel Carrillo
2019-05-03 22:54 ` Erik Gabriel Carrillo
2019-05-07 11:03 ` Burakov, Anatoly
2019-05-07 11:03 ` Burakov, Anatoly
2019-05-07 22:04 ` Carrillo, Erik G
2019-05-07 22:04 ` Carrillo, Erik G
2019-05-08 8:49 ` Burakov, Anatoly
2019-05-08 8:49 ` Burakov, Anatoly
2019-05-08 23:01 ` Carrillo, Erik G
2019-05-08 23:01 ` Carrillo, Erik G
2019-05-09 7:44 ` Thomas Monjalon
2019-05-09 7:44 ` Thomas Monjalon
2019-05-08 22:35 ` [dpdk-dev] [PATCH v3] " Erik Gabriel Carrillo
2019-05-08 22:35 ` Erik Gabriel Carrillo
2019-05-09 8:29 ` Burakov, Anatoly
2019-05-09 8:29 ` Burakov, Anatoly
2019-06-05 9:33 ` Thomas Monjalon
2019-06-05 9:47 ` Burakov, Anatoly [this message]
2019-06-25 16:11 ` [dpdk-dev] [PATCH 0/2] Fix timer resource leak Anatoly Burakov
2019-07-05 13:20 ` [dpdk-dev] [PATCH v2 0/1] " Anatoly Burakov
2019-07-05 17:22 ` [dpdk-dev] [PATCH v3 " Anatoly Burakov
2019-07-05 17:22 ` [dpdk-dev] [PATCH v3 1/1] timer: fix resource leak in finalize Anatoly Burakov
2019-07-05 22:06 ` Thomas Monjalon
2019-07-05 13:20 ` [dpdk-dev] [PATCH v2 " Anatoly Burakov
2019-06-25 16:11 ` [dpdk-dev] [PATCH 1/2] eal: add internal locks for timer lib into EAL Anatoly Burakov
2019-06-27 18:41 ` Carrillo, Erik G
2019-07-04 9:09 ` David Marchand
2019-07-04 10:44 ` Burakov, Anatoly
2019-06-25 16:11 ` [dpdk-dev] [PATCH 2/2] timer: fix resource leak in finalize Anatoly Burakov
2019-06-27 18:48 ` Carrillo, Erik G
2019-07-04 9:10 ` David Marchand
2019-07-04 10:45 ` Burakov, Anatoly
2019-07-04 10:50 ` David Marchand
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=6fa30d88-c266-5864-8aee-171a2e61d37e@intel.com \
--to=anatoly.burakov@intel.com \
--cc=david.marchand@redhat.com \
--cc=dev@dpdk.org \
--cc=erik.g.carrillo@intel.com \
--cc=rsanford@akamai.com \
--cc=thomas@monjalon.net \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).