From: Eric Blake <eblake@redhat.com>
To: Tao Xu <tao3.xu@intel.com>, imammedo@redhat.com, ehabkost@redhat.com
Cc: jingqi.liu@intel.com, fan.du@intel.com, qemu-devel@nongnu.org,
jonathan.cameron@huawei.com
Subject: Re: [PATCH v13 01/12] util/cutils: Add qemu_strtotime_ps()
Date: Tue, 22 Oct 2019 20:13:35 -0500 [thread overview]
Message-ID: <7a0662f5-28e3-4bb8-0b20-669d34cf56a6@redhat.com> (raw)
In-Reply-To: <20191020111125.27659-2-tao3.xu@intel.com>
On 10/20/19 6:11 AM, Tao Xu wrote:
> To convert strings with time suffixes to numbers, support time unit are
> "ps" for picosecond, "ns" for nanosecond, "us" for microsecond, "ms"
> for millisecond or "s" for second.
I haven't yet reviewed the patch itself, but my off-hand observation:
picosecond is probably too narrow to ever be useful. POSIX interfaces
only go down to nanoseconds, and when you start adding in vmexit delay
times and such, we're lucky when we get anything better than microsecond
accuracies. Supporting just three sub-second suffixes instead of four
would slightly simplify the code, and not cost you any real precision.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
next prev parent reply other threads:[~2019-10-23 1:14 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-20 11:11 [PATCH v13 00/12] Build ACPI Heterogeneous Memory Attribute Table (HMAT) Tao Xu
2019-10-20 11:11 ` [PATCH v13 01/12] util/cutils: Add qemu_strtotime_ps() Tao Xu
2019-10-23 1:08 ` Eduardo Habkost
2019-10-23 6:07 ` Tao Xu
2019-10-23 1:13 ` Eric Blake [this message]
2019-10-23 1:50 ` Tao Xu
2019-10-24 9:54 ` Daniel P. Berrangé
2019-10-24 13:20 ` Eduardo Habkost
2019-10-25 1:22 ` Tao Xu
2019-10-20 11:11 ` [PATCH v13 02/12] tests/cutils: Add test for qemu_strtotime_ps() Tao Xu
2019-10-20 11:11 ` [PATCH v13 03/12] qapi: Add builtin type time Tao Xu
2019-10-20 11:11 ` [PATCH v13 04/12] tests: Add test for QAPI " Tao Xu
2019-10-20 11:11 ` [PATCH v13 05/12] numa: Extend CLI to provide initiator information for numa nodes Tao Xu
2019-10-21 12:29 ` Igor Mammedov
2019-10-22 1:01 ` Tao Xu
2019-10-20 11:11 ` [PATCH v13 06/12] numa: Extend CLI to provide memory latency and bandwidth information Tao Xu
2019-10-22 7:08 ` Igor Mammedov
2019-10-22 8:22 ` Tao Xu
2019-10-23 15:28 ` Igor Mammedov
2019-10-25 6:33 ` Tao Xu
2019-10-25 13:27 ` Igor Mammedov
2019-10-25 19:44 ` Markus Armbruster
2019-10-25 20:51 ` Eduardo Habkost
2019-10-28 2:05 ` Tao Xu
2019-10-28 5:46 ` Markus Armbruster
2019-10-28 7:25 ` Tao Xu
2019-10-20 11:11 ` [PATCH v13 07/12] numa: Calculate hmat latency and bandwidth entry list Tao Xu
2019-10-20 11:11 ` [PATCH v13 08/12] numa: Extend CLI to provide memory side cache information Tao Xu
2019-10-20 11:11 ` [PATCH v13 09/12] hmat acpi: Build Memory Proximity Domain Attributes Structure(s) Tao Xu
2019-10-20 11:11 ` [PATCH v13 10/12] hmat acpi: Build System Locality Latency and Bandwidth Information Structure(s) Tao Xu
2019-10-20 11:11 ` [PATCH v13 11/12] hmat acpi: Build Memory Side Cache " Tao Xu
2019-10-20 11:11 ` [PATCH v13 12/12] tests/bios-tables-test: add test cases for ACPI HMAT Tao Xu
2019-10-20 11:43 ` [PATCH v13 00/12] Build ACPI Heterogeneous Memory Attribute Table (HMAT) no-reply
2019-10-20 12:13 ` no-reply
2019-10-20 12:57 ` no-reply
2019-10-20 13:19 ` no-reply
2019-10-22 11:22 ` Markus Armbruster
2019-10-23 1:46 ` Tao Xu
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