tc_acquire_table and tc_release_table are critical sections of table cache. Among other things, they update TABLE_SHARE::tdc.free_tables:
tc_acquire_table - pop TABLE object from free_tables
tc_release_table - push TABLE object to free_tables
Updating free_tables list is protected by global mutex. Since free_tables is per-share list we can protect it by per-share mutex instead.
This is simple intermediate change that improves table cache scalability in many loads.
| Transition |
Time In Source Status |
Execution Times |
|
Open |
|
Closed |
|
5d 18h 49m
|
1
|
{"report":{"fcp":1752.4000000953674,"ttfb":488.1000003814697,"pageVisibility":"visible","entityId":33011,"key":"jira.project.issue.view-issue","isInitial":true,"threshold":1000,"elementTimings":{},"userDeviceMemory":8,"userDeviceProcessors":64,"apdex":0.5,"journeyId":"fea8a6d9-423b-4890-9fce-ee1f0e3a7e5e","navigationType":0,"readyForUser":1860.2000002861023,"redirectCount":0,"resourceLoadedEnd":2320.300000190735,"resourceLoadedStart":499.2000002861023,"resourceTiming":[{"duration":692,"initiatorType":"link","name":"https://jira.mariadb.org/s/2c21342762a6a02add1c328bed317ffd-CDN/lu2cib/820016/12ta74/0a8bac35585be7fc6c9cc5a0464cd4cf/_/download/contextbatch/css/_super/batch.css","startTime":499.2000002861023,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":499.2000002861023,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":1191.2000002861023,"responseStart":0,"secureConnectionStart":0},{"duration":692,"initiatorType":"link","name":"https://jira.mariadb.org/s/7ebd35e77e471bc30ff0eba799ebc151-CDN/lu2cib/820016/12ta74/494e4c556ecbb29f90a3d3b4f09cb99c/_/download/contextbatch/css/jira.browse.project,project.issue.navigator,jira.view.issue,jira.general,jira.global,atl.general,-_super/batch.css?agile_global_admin_condition=true&jag=true&jira.create.linked.issue=true&slack-enabled=true&whisper-enabled=true","startTime":499.40000009536743,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":499.40000009536743,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":1191.4000000953674,"responseStart":0,"secureConnectionStart":0},{"duration":707.1999998092651,"initiatorType":"script","name":"https://jira.mariadb.org/s/0917945aaa57108d00c5076fea35e069-CDN/lu2cib/820016/12ta74/0a8bac35585be7fc6c9cc5a0464cd4cf/_/download/contextbatch/js/_super/batch.js?locale=en","startTime":499.6000003814697,"connectEnd":499.6000003814697,"connectStart":499.6000003814697,"domainLookupEnd":499.6000003814697,"domainLookupStart":499.6000003814697,"fetchStart":499.6000003814697,"redirectEnd":0,"redirectStart":0,"requestStart":499.6000003814697,"responseEnd":1206.8000001907349,"responseStart":1206.8000001907349,"secureConnectionStart":499.6000003814697},{"duration":834.0999999046326,"initiatorType":"script","name":"https://jira.mariadb.org/s/2d8175ec2fa4c816e8023260bd8c1786-CDN/lu2cib/820016/12ta74/494e4c556ecbb29f90a3d3b4f09cb99c/_/download/contextbatch/js/jira.browse.project,project.issue.navigator,jira.view.issue,jira.general,jira.global,atl.general,-_super/batch.js?agile_global_admin_condition=true&jag=true&jira.create.linked.issue=true&locale=en&slack-enabled=true&whisper-enabled=true","startTime":499.80000019073486,"connectEnd":499.80000019073486,"connectStart":499.80000019073486,"domainLookupEnd":499.80000019073486,"domainLookupStart":499.80000019073486,"fetchStart":499.80000019073486,"redirectEnd":0,"redirectStart":0,"requestStart":499.80000019073486,"responseEnd":1333.9000000953674,"responseStart":1333.9000000953674,"secureConnectionStart":499.80000019073486},{"duration":838.6000003814697,"initiatorType":"script","name":"https://jira.mariadb.org/s/a9324d6758d385eb45c462685ad88f1d-CDN/lu2cib/820016/12ta74/c92c0caa9a024ae85b0ebdbed7fb4bd7/_/download/contextbatch/js/atl.global,-_super/batch.js?locale=en","startTime":500,"connectEnd":500,"connectStart":500,"domainLookupEnd":500,"domainLookupStart":500,"fetchStart":500,"redirectEnd":0,"redirectStart":0,"requestStart":500,"responseEnd":1338.6000003814697,"responseStart":1338.6000003814697,"secureConnectionStart":500},{"duration":839.5,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2cib/820016/12ta74/1.0/_/download/batch/jira.webresources:calendar-en/jira.webresources:calendar-en.js","startTime":500.1000003814697,"connectEnd":500.1000003814697,"connectStart":500.1000003814697,"domainLookupEnd":500.1000003814697,"domainLookupStart":500.1000003814697,"fetchStart":500.1000003814697,"redirectEnd":0,"redirectStart":0,"requestStart":500.1000003814697,"responseEnd":1339.6000003814697,"responseStart":1339.6000003814697,"secureConnectionStart":500.1000003814697},{"duration":840.8000001907349,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2cib/820016/12ta74/1.0/_/download/batch/jira.webresources:calendar-localisation-moment/jira.webresources:calendar-localisation-moment.js","startTime":500.30000019073486,"connectEnd":500.30000019073486,"connectStart":500.30000019073486,"domainLookupEnd":500.30000019073486,"domainLookupStart":500.30000019073486,"fetchStart":500.30000019073486,"redirectEnd":0,"redirectStart":0,"requestStart":500.30000019073486,"responseEnd":1341.1000003814697,"responseStart":1341.1000003814697,"secureConnectionStart":500.30000019073486},{"duration":880.7000002861023,"initiatorType":"link","name":"https://jira.mariadb.org/s/b04b06a02d1959df322d9cded3aeecc1-CDN/lu2cib/820016/12ta74/a2ff6aa845ffc9a1d22fe23d9ee791fc/_/download/contextbatch/css/jira.global.look-and-feel,-_super/batch.css","startTime":500.5,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":500.5,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":1381.2000002861023,"responseStart":0,"secureConnectionStart":0},{"duration":841.1999998092651,"initiatorType":"script","name":"https://jira.mariadb.org/rest/api/1.0/shortcuts/820016/47140b6e0a9bc2e4913da06536125810/shortcuts.js?context=issuenavigation&context=issueaction","startTime":500.7000002861023,"connectEnd":500.7000002861023,"connectStart":500.7000002861023,"domainLookupEnd":500.7000002861023,"domainLookupStart":500.7000002861023,"fetchStart":500.7000002861023,"redirectEnd":0,"redirectStart":0,"requestStart":500.7000002861023,"responseEnd":1341.9000000953674,"responseStart":1341.9000000953674,"secureConnectionStart":500.7000002861023},{"duration":880.5,"initiatorType":"link","name":"https://jira.mariadb.org/s/3ac36323ba5e4eb0af2aa7ac7211b4bb-CDN/lu2cib/820016/12ta74/d176f0986478cc64f24226b3d20c140d/_/download/contextbatch/css/com.atlassian.jira.projects.sidebar.init,-_super,-project.issue.navigator,-jira.view.issue/batch.css?jira.create.linked.issue=true","startTime":500.80000019073486,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":500.80000019073486,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":1381.3000001907349,"responseStart":0,"secureConnectionStart":0},{"duration":841.6000003814697,"initiatorType":"script","name":"https://jira.mariadb.org/s/5d5e8fe91fbc506585e83ea3b62ccc4b-CDN/lu2cib/820016/12ta74/d176f0986478cc64f24226b3d20c140d/_/download/contextbatch/js/com.atlassian.jira.projects.sidebar.init,-_super,-project.issue.navigator,-jira.view.issue/batch.js?jira.create.linked.issue=true&locale=en","startTime":501,"connectEnd":501,"connectStart":501,"domainLookupEnd":501,"domainLookupStart":501,"fetchStart":501,"redirectEnd":0,"redirectStart":0,"requestStart":501,"responseEnd":1342.6000003814697,"responseStart":1342.6000003814697,"secureConnectionStart":501},{"duration":1216.5,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2cib/820016/12ta74/1.0/_/download/batch/jira.webresources:bigpipe-js/jira.webresources:bigpipe-js.js","startTime":509.5,"connectEnd":509.5,"connectStart":509.5,"domainLookupEnd":509.5,"domainLookupStart":509.5,"fetchStart":509.5,"redirectEnd":0,"redirectStart":0,"requestStart":509.5,"responseEnd":1726,"responseStart":1726,"secureConnectionStart":509.5},{"duration":1810.8000001907349,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2cib/820016/12ta74/1.0/_/download/batch/jira.webresources:bigpipe-init/jira.webresources:bigpipe-init.js","startTime":509.5,"connectEnd":509.5,"connectStart":509.5,"domainLookupEnd":509.5,"domainLookupStart":509.5,"fetchStart":509.5,"redirectEnd":0,"redirectStart":0,"requestStart":509.5,"responseEnd":2320.300000190735,"responseStart":2320.300000190735,"secureConnectionStart":509.5},{"duration":337.1000003814697,"initiatorType":"xmlhttprequest","name":"https://jira.mariadb.org/rest/webResources/1.0/resources","startTime":1404,"connectEnd":1404,"connectStart":1404,"domainLookupEnd":1404,"domainLookupStart":1404,"fetchStart":1404,"redirectEnd":0,"redirectStart":0,"requestStart":1404,"responseEnd":1741.1000003814697,"responseStart":1741.1000003814697,"secureConnectionStart":1404},{"duration":628,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2cib/820016/12ta74/e65b778d185daf5aee24936755b43da6/_/download/contextbatch/js/browser-metrics-plugin.contrib,-_super,-project.issue.navigator,-jira.view.issue,-atl.general/batch.js?agile_global_admin_condition=true&jag=true&jira.create.linked.issue=true&slack-enabled=true&whisper-enabled=true","startTime":1778.8000001907349,"connectEnd":1778.8000001907349,"connectStart":1778.8000001907349,"domainLookupEnd":1778.8000001907349,"domainLookupStart":1778.8000001907349,"fetchStart":1778.8000001907349,"redirectEnd":0,"redirectStart":0,"requestStart":1778.8000001907349,"responseEnd":2406.800000190735,"responseStart":2406.800000190735,"secureConnectionStart":1778.8000001907349}],"fetchStart":0,"domainLookupStart":0,"domainLookupEnd":0,"connectStart":0,"connectEnd":0,"requestStart":312,"responseStart":488,"responseEnd":502,"domLoading":498,"domInteractive":2349,"domContentLoadedEventStart":2349,"domContentLoadedEventEnd":2395,"domComplete":2821,"loadEventStart":2821,"loadEventEnd":2821,"userAgent":"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)","marks":[{"name":"bigPipe.sidebar-id.start","time":2325.800000190735},{"name":"bigPipe.sidebar-id.end","time":2326.7000002861023},{"name":"bigPipe.activity-panel-pipe-id.start","time":2326.800000190735},{"name":"bigPipe.activity-panel-pipe-id.end","time":2327.7000002861023},{"name":"activityTabFullyLoaded","time":2409}],"measures":[],"correlationId":"e24b219d4acc0","effectiveType":"4g","downlink":9.9,"rtt":0,"serverDuration":112,"dbReadsTimeInMs":25,"dbConnsTimeInMs":36,"applicationHash":"9d11dbea5f4be3d4cc21f03a88dd11d8c8687422","experiments":[]}}
Bug
Major
MDEV-4702 Reduce usage of LOCK_open