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From: Krzysztof Kanas <kkanas@marvell.com>
To: David Marchand <david.marchand@redhat.com>
Cc: Krzysztof Kanas <kkanas@marvell.com>, dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] [EXT] Re: [PATCH v2] test: fix process dup fd close
Date: Mon, 4 Nov 2019 07:52:22 +0000
Message-ID: <20191104075219.GA8346@kk-box-0> (raw)
In-Reply-To: <CAJFAV8y2tvNDqtvU=iyaJpEfB=0jPez=dG0mHX_3_VMH9bFPCQ@mail.gmail.com>

On 19-10-30 10:06, David Marchand wrote:
> External Email
> 
> ----------------------------------------------------------------------
> On Mon, Sep 2, 2019 at 11:50 AM <kkanas@marvell.com> wrote:
> >
> > From: Krzysztof Kanas <kkanas@marvell.com>
> >
> > process_dup was intending to close it's own fd's but failed to do so
> 
> A bit hard to digest, what is the problem that you want to fix?
> 
> Thanks.

I don't recall the exact test name but I think it was test_eal_flags 
that is included in the meson test suite for fast tests.
This test was timing out on ARM64.

Using strace (-f -c IIRC) showed that the process is spending most of 
the time in access syscall trying to close not existing fd's.

-               for (fd = getdtablesize(); fd > 2; fd-- ) {
-                       snprintf(path, sizeof(path), "/proc/" exe "/fd/%d", fd);
-                       if (access(path, F_OK) == 0)
-                               close(fd);

So the simplest way to do so is to close only the opened fd's not
blindly try every possible one.

Also I think the code was wrong in another way as it tried to iterate 
over /proc/ *exe* /fd/%d/ when it should iterate over /proc/ *self* 
/fd/, so either the comment bove the for loop was wrong or the code was 
incorrect.


> 
> 
> -- 
> David Marchand
> 

-- 
-
Regards,
Krzysztof(Chris) Kanas

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-02  7:52 [dpdk-dev] [PATCH] " kkanas
2019-09-02  9:49 ` [dpdk-dev] [PATCH v2] " kkanas
2019-09-23 11:32   ` Krzysztof Kanas
2019-10-30  9:06   ` David Marchand
2019-11-04  7:52     ` Krzysztof Kanas [this message]
2019-11-06 14:36       ` [dpdk-dev] [EXT] " David Marchand
2019-11-06 14:58   ` [dpdk-dev] " David Marchand
2019-11-08 10:21     ` [dpdk-dev] [PATCH v3 0/3] test: fix timeout in flags autotest kkanas
2019-11-08 10:21       ` [dpdk-dev] [PATCH v3 1/3] " kkanas
2019-11-08 10:21       ` [dpdk-dev] [PATCH v3 2/3] test: move close files to separate function kkanas
2019-11-08 10:21       ` [dpdk-dev] [PATCH v3 3/3] test: fix FreeBSD file closing function kkanas
2019-11-08 11:05       ` [dpdk-dev] [PATCH v3 0/3] test: fix timeout in flags autotest David Marchand
2019-11-08 11:11         ` David Marchand
2019-11-08 13:45         ` David Marchand
2019-11-12  8:26           ` [dpdk-dev] [EXT] " Krzysztof Kanas
2019-11-12 20:34             ` David Marchand
2019-11-13 13:35               ` Krzysztof Kanas
2019-11-12 20:31 ` [dpdk-dev] [PATCH v4] test: optimise fd closing in forked test process David Marchand
2019-11-14 19:31   ` Kevin Traynor
2019-11-15  8:11     ` David Marchand

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