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https://issues.apache.org/jira/browse/ARTEMIS-1977?focusedWorklogId=190177&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-190177
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ASF GitHub Bot logged work on ARTEMIS-1977:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Jan/19 20:46
Start Date: 25/Jan/19 20:46
Worklog Time Spent: 10m
Work Description: clebertsuconic commented on pull request #2523:
ARTEMIS-1977 ASYNCIO can reduce sys-calls to retrieve I/O events
URL: https://github.com/apache/activemq-artemis/pull/2523#discussion_r251130524
##########
File path:
artemis-native/src/main/c/org_apache_activemq_artemis_jlibaio_LibaioContext.c
##########
@@ -57,6 +57,92 @@ struct io_control {
};
+//These should be used to check if the user_io_getevents is supported, but
almost every modern kernel support it
+#define AIO_RING_MAGIC 0xa10a10a1
+#define AIO_RING_INCOMPAT_FEATURES 0
+//memory order relaxed/acquire/release/seq_cst x86_64 fences implementations
+#define mem_barrier() __asm__ __volatile__ ("":::"memory")
+#define read_barrier() __asm__ __volatile__("lfence":::"memory")
+#define store_barrier() __asm__ __volatile__("sfence":::"memory")
+#define full_barrier() __asm__ __volatile__("mfence":::"memory")
+
Review comment:
Is there any documentation about this?
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Issue Time Tracking
-------------------
Worklog Id: (was: 190177)
Time Spent: 1.5h (was: 1h 20m)
> ASYNCIO can reduce sys-calls to retrieve I/O events
> ---------------------------------------------------
>
> Key: ARTEMIS-1977
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1977
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.6.2
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Minor
> Fix For: 2.7.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> On LibAIO is possible to retrieve the I/O completion events without
> using io_getevents sys-calls by reading the user-space ring buffer used by the
> kernel to store them.
> This is already beneficial for very fast disks and necessary for further
> improvements
> of ASYNCIO Journal to leverage (very) fast low-latency disks by going
> completly
> lock-free.
>
>
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