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This results in enormous numbers in the measured latency. The wrong latency makes histograms from biolatency occupies a lot of screen lines and the shows very high (and impossible) numbers on biotop.\\r\\n\\r\\nThis fix adds a check if signed delta is a negative number, in this case, the time of request completion is older than the request start and the offensor request is discarded.\\r\\n\\r\\nThis is the biolatency output before this change:\\r\\n\\r\\n```\\r\\nTracing block device I/O... Hit Ctrl-C to end.\\r\\n^C\\r\\n usecs : count distribution\\r\\n 0 -> 1 : 0 | |\\r\\n 2 -> 3 : 0 | |\\r\\n 4 -> 7 : 0 | |\\r\\n 8 -> 15 : 0 | |\\r\\n 16 -> 31 : 25 | |\\r\\n 32 -> 63 : 32 | |\\r\\n 64 -> 127 : 254 | |\\r\\n 128 -> 255 : 2164 |* |\\r\\n 256 -> 511 : 5421 |*** |\\r\\n 512 -> 1023 : 29795 |********************|\\r\\n 1024 -> 2047 : 17042 |*********** |\\r\\n 2048 -> 4095 : 6400 |**** |\\r\\n 4096 -> 8191 : 4935 |*** |\\r\\n 8192 -> 16383 : 588 | |\\r\\n 16384 -> 32767 : 54 | |\\r\\n 32768 -> 65535 : 14 | |\\r\\n 65536 -> 131071 : 4 | |\\r\\n 131072 -> 262143 : 4 | |\\r\\n 262144 -> 524287 : 0 | |\\r\\n 524288 -> 1048575 : 0 | |\\r\\n 1048576 -> 2097151 : 0 | |\\r\\n 2097152 -> 4194303 : 0 | |\\r\\n 4194304 -> 8388607 : 0 | |\\r\\n 8388608 -> 16777215 : 0 | |\\r\\n 16777216 -> 33554431 : 0 | |\\r\\n 33554432 -> 67108863 : 0 | |\\r\\n 67108864 -> 134217727 : 0 | |\\r\\n 134217728 -> 268435455 : 0 | |\\r\\n 268435456 -> 536870911 : 0 | |\\r\\n 536870912 -> 1073741823 : 0 | |\\r\\n 1073741824 -> 2147483647 : 0 | |\\r\\n 2147483648 -> 4294967295 : 0 | |\\r\\n 4294967296 -> 8589934591 : 0 | |\\r\\n 8589934592 -> 17179869183 : 0 | |\\r\\n 17179869184 -> 34359738367 : 0 | |\\r\\n 34359738368 -> 68719476735 : 0 | |\\r\\n 68719476736 -> 137438953471 : 0 | |\\r\\n 137438953472 -> 274877906943 : 0 | |\\r\\n 274877906944 -> 549755813887 : 0 | |\\r\\n 549755813888 -> 1099511627775 : 0 | |\\r\\n 1099511627776 -> 2199023255551 : 0 | |\\r\\n 2199023255552 -> 4398046511103 : 0 | |\\r\\n 4398046511104 -> 8796093022207 : 0 | |\\r\\n 8796093022208 -> 17592186044415 : 0 | |\\r\\n 17592186044416 -> 35184372088831 : 0 | |\\r\\n 35184372088832 -> 70368744177663 : 0 | |\\r\\n 70368744177664 -> 140737488355327 : 0 | |\\r\\n 140737488355328 -> 281474976710655 : 0 | |\\r\\n 281474976710656 -> 562949953421311 : 0 | |\\r\\n 562949953421312 -> 1125899906842623 : 0 | |\\r\\n 1125899906842624 -> 2251799813685247 : 0 | |\\r\\n 2251799813685248 -> 4503599627370495 : 0 | |\\r\\n 4503599627370496 -> 9007199254740991 : 0 | |\\r\\n 9007199254740992 -> 18014398509481983 : 0 | |\\r\\n 18014398509481984 -> 36028797018963967 : 17 | |\\r\\n```\\r\\n\\r\\nAnd this one is after the bug is fixed:\\r\\n\\r\\n```\\r\\nTracing block device I/O... Hit Ctrl-C to end.\\r\\n^C\\r\\n usecs : count distribution\\r\\n 0 -> 1 : 0 | |\\r\\n 2 -> 3 : 0 | |\\r\\n 4 -> 7 : 0 | |\\r\\n 8 -> 15 : 0 | |\\r\\n 16 -> 31 : 163 | |\\r\\n 32 -> 63 : 339 | |\\r\\n 64 -> 127 : 258 | |\\r\\n 128 -> 255 : 2259 |** |\\r\\n 256 -> 511 : 5677 |****** |\\r\\n 512 -> 1023 : 32662 |****************************************|\\r\\n 1024 -> 2047 : 20252 |************************ |\\r\\n 2048 -> 4095 : 12544 |*************** |\\r\\n 4096 -> 8191 : 11006 |************* |\\r\\n 8192 -> 16383 : 1230 |* |\\r\\n 16384 -> 32767 : 201 | |\\r\\n 32768 -> 65535 : 544 | |\\r\\n 65536 -> 131071 : 746 | |\\r\\n 131072 -> 262143 : 881 |* |\\r\\n 262144 -> 524287 : 309 | |\\r\\n```\\r\\n\\r\\nThanks!" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbCommentBody", "value" : "[buildbot, test this please]" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbGhRepository", "value" : "iovisor/bcc" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbCredentialsId", "value" : "6d3daf13-69b8-48b1-9c8f-ec5353264113" } ] }, { "_class" : "hudson.plugins.git.GitTagAction" }, { }, { }, { "_class" : "org.jenkinsci.plugins.displayurlapi.actions.RunDisplayAction" } ], "artifacts" : [ ], "building" : False, "description" : "PR #2660: Fix time going backwards on...", "displayName" : "#189", "duration" : 1429387, "estimatedDuration" : 7460664, "executor" : None, "fullDisplayName" : "bcc-pr #189", "id" : "189", "keepLog" : False, "number" : 189, "queueId" : 1541, "result" : "SUCCESS", "timestamp" : 1576997536800, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/189/", "builtOn" : "", "changeSet" : { "_class" : "hudson.plugins.git.GitChangeSetList", "items" : [ ], "kind" : "git" }, "culprits" : [ ], "runs" : [ { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc25/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc26/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc27/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc28/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1604/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1710/189/" }, { "number" : 189, "url" : "https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1804/189/" } ] }