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From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: Tyler Retzlaff <roretzla@linux.microsoft.com>
Cc: dev@dpdk.org, thomas@monjalon.net, anatoly.burakov@intel.com,
	Narcisa Vasile <navasile@microsoft.com>
Subject: Re: [PATCH v4 2/3] eal: implement functions for get/set thread affinity
Date: Sun, 1 May 2022 12:18:33 +0300	[thread overview]
Message-ID: <20220501121833.439756f1@sovereign> (raw)
In-Reply-To: <1650959442-29330-3-git-send-email-roretzla@linux.microsoft.com>

2022-04-26 00:50 (UTC-0700), Tyler Retzlaff:
> Implement functions for getting/setting thread affinity.
> Threads can be pinned to specific cores by setting their
> affinity attribute.
> 
> Windows error codes are translated to errno-style error codes.
> The possible return values are chosen so that we have as
> much semantic compatibility between platforms as possible.
> 
> note: convert_cpuset_to_affinity has a limitation that all cpus of
> the set belong to the same processor group.
> 
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
with two minor issues below.

> +static int
> +eal_query_group_affinity(void)
> +{
> +	SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *infos = NULL;
> +	unsigned int *cpu_count = &cpu_map.cpu_count;
> +	DWORD infos_size = 0;
> +	int ret = 0;
> +	USHORT group_count;
> +	KAFFINITY affinity;
> +	USHORT group_no;
> +	unsigned int i;
> +
> +	if (!GetLogicalProcessorInformationEx(RelationGroup, NULL,
> +			&infos_size)) {
> +		DWORD error = GetLastError();
> +		if (error != ERROR_INSUFFICIENT_BUFFER) {
> +			log_early("Cannot get group information size, error %lu\n", error);

This code is now called not only at initialization,
but also after the logging is set up,
in which case this line will not go into a redirected destination.

I think there should not be log_early() at all in EAL,
rte_log() could work from the very beginning.
We're not in the kernel, stderr is available at once.

So I would work around with a static flag maybe.

[...]
> +static int
> +convert_cpuset_to_affinity(const rte_cpuset_t *cpuset,
> +		PGROUP_AFFINITY affinity)
> +{
> +	int ret = 0;
> +	PGROUP_AFFINITY cpu_affinity = NULL;
> +	unsigned int cpu_idx;
> +
> +	memset(affinity, 0, sizeof(GROUP_AFFINITY));
> +	affinity->Group = (USHORT)-1;
> +
> +	/* Check that all cpus of the set belong to the same processor group and
> +	 * accumulate thread affinity to be applied.
> +	 */
> +	for (cpu_idx = 0; cpu_idx < CPU_SETSIZE; cpu_idx++) {
> +		if (!CPU_ISSET(cpu_idx, cpuset))
> +			continue;
> +
> +		cpu_affinity = eal_get_cpu_affinity(cpu_idx);
> +
> +		if (affinity->Group == (USHORT)-1) {
> +			affinity->Group = cpu_affinity->Group;
> +		} else if (affinity->Group != cpu_affinity->Group) {
> +			ret = ENOTSUP;

Maybe worth a dedug log because the limitation is non-obvious.


  reply	other threads:[~2022-05-01  9:18 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-01 13:29 [PATCH 0/3] add eal functions for " Tyler Retzlaff
2022-04-01 13:29 ` [PATCH 1/3] eal/windows: translate Windows errors to errno-style errors Tyler Retzlaff
2022-04-01 13:29 ` [PATCH 2/3] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-04-08 14:01   ` Dmitry Kozlyuk
2022-04-09  8:02     ` Tyler Retzlaff
2022-04-01 13:29 ` [PATCH 3/3] test/threads: add unit test for thread API Tyler Retzlaff
2022-04-08 14:01   ` Dmitry Kozlyuk
2022-04-09  8:56     ` Tyler Retzlaff
2022-04-11 22:52       ` Dmitry Kozlyuk
2022-04-08  8:57 ` [PATCH 0/3] add eal functions for thread affinity David Marchand
2022-04-08 13:46   ` Tyler Retzlaff
2022-04-11  7:32     ` David Marchand
2022-04-12 10:43 ` [PATCH v2 0/4] add eal functions for thread affinity and self Tyler Retzlaff
2022-04-12 10:43   ` [PATCH v2 1/4] eal/windows: translate Windows errors to errno-style errors Tyler Retzlaff
2022-04-12 17:26     ` Menon, Ranjit
2022-04-13  7:07       ` Tyler Retzlaff
2022-04-25  8:25     ` David Marchand
2022-04-25  8:52       ` Tyler Retzlaff
2022-04-12 10:43   ` [PATCH v2 2/4] eal: add basic thread ID and current thread identifier API Tyler Retzlaff
2022-04-12 10:43   ` [PATCH v2 3/4] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-04-13  7:30     ` Tyler Retzlaff
2022-04-12 10:43   ` [PATCH v2 4/4] test/threads: add unit test for thread API Tyler Retzlaff
2022-04-13  7:43 ` [PATCH v3 0/4] add eal functions for thread affinity and self Tyler Retzlaff
2022-04-13  7:43   ` [PATCH v3 1/4] eal/windows: translate Windows errors to errno-style errors Tyler Retzlaff
2022-04-13  7:43   ` [PATCH v3 2/4] eal: add basic thread ID and current thread identifier API Tyler Retzlaff
2022-04-25  8:26     ` David Marchand
2022-04-25  8:53       ` Tyler Retzlaff
2022-04-13  7:43   ` [PATCH v3 3/4] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-04-25  8:26     ` David Marchand
2022-04-25  8:55       ` Tyler Retzlaff
2022-04-13  7:43   ` [PATCH v3 4/4] test/threads: add unit test for thread API Tyler Retzlaff
2022-04-26  7:50 ` [PATCH v4 0/3] add eal functions for thread affinity and self Tyler Retzlaff
2022-04-26  7:50   ` [PATCH v4 1/3] eal: add basic thread ID and current thread identifier API Tyler Retzlaff
2022-05-01  9:18     ` Dmitry Kozlyuk
2022-04-26  7:50   ` [PATCH v4 2/3] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-05-01  9:18     ` Dmitry Kozlyuk [this message]
2022-04-26  7:50   ` [PATCH v4 3/3] test/threads: add unit test for thread API Tyler Retzlaff
2022-05-01  9:18     ` Dmitry Kozlyuk
2022-05-03  9:38       ` Tyler Retzlaff
2022-05-04 15:46 ` [PATCH v5 0/3] add eal functions for thread affinity and self Tyler Retzlaff
2022-05-04 15:46   ` [PATCH v5 1/3] eal: add basic thread ID and current thread identifier API Tyler Retzlaff
2022-05-04 22:55     ` Konstantin Ananyev
2022-05-05  7:11       ` Tyler Retzlaff
2022-05-06 19:37         ` Konstantin Ananyev
2022-05-07  8:25           ` Morten Brørup
2022-05-07 13:57             ` Konstantin Ananyev
2022-05-07 19:47               ` Morten Brørup
2022-05-10 21:52                 ` Konstantin Ananyev
2022-05-11  7:17                   ` Tyler Retzlaff
2022-05-11  7:36                     ` Morten Brørup
2022-05-11 22:27                     ` Konstantin Ananyev
2022-05-04 15:46   ` [PATCH v5 2/3] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-05-04 15:46   ` [PATCH v5 3/3] test/threads: add unit test for thread API Tyler Retzlaff
2022-05-12 13:14 ` [PATCH v6 0/3] add eal functions for thread affinity and self Tyler Retzlaff
2022-05-12 13:14   ` [PATCH v6 1/3] eal: add basic thread ID and current thread identifier API Tyler Retzlaff
2022-05-15 22:02     ` Konstantin Ananyev
2022-05-16  6:21       ` Tyler Retzlaff
2022-05-12 13:14   ` [PATCH v6 2/3] eal: implement functions for get/set thread affinity Tyler Retzlaff
2022-05-12 13:14   ` [PATCH v6 3/3] test/threads: add unit test for thread API Tyler Retzlaff
2022-05-19 15:05   ` [PATCH v6 0/3] add eal functions for thread affinity and self David Marchand

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