GitHub pull request #3309 of commit eec3de77295ff91b2e4ee3df81b602930f4882ad, no merge conflicts.sha1origin/pr/3309/mergeghprbActualCommiteec3de77295ff91b2e4ee3df81b602930f4882adghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/ethercflow/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3309ghprbTargetBranchmasterghprbSourceBranchext4distGIT_BRANCHext4distghprbPullAuthorEmailethercflow@gmail.comghprbPullAuthorLoginethercflowghprbPullAuthorLoginMention@ethercflowghprbPullDescriptionGitHub pull request #3309 of commit eec3de77295ff91b2e4ee3df81b602930f4882ad, no merge conflicts.ghprbPullTitlelibbpf-tools: add ext4distghprbPullLinkhttps://github.com/iovisor/bcc/pull/3309ghprbPullLongDescription```sh\r\n➜ libbpf-tools git:(ext4dist) ✗ sudo ./ext4dist 1 5\r\nTracing ext4 operation latency... Hit Ctrl-C to end.\r\n\r\n\r\noperation = 'read_iter'\r\n usecs : count distribution\r\n 0 -> 1 : 257 |****************************************|\r\n 2 -> 3 : 12 |* |\r\n 4 -> 7 : 2 | |\r\n\r\noperation = 'write_iter'\r\n usecs : count distribution\r\n 0 -> 1 : 79 |*** |\r\n 2 -> 3 : 831 |****************************************|\r\n 4 -> 7 : 543 |************************** |\r\n 8 -> 15 : 105 |***** |\r\n 16 -> 31 : 5 | |\r\n\r\noperation = 'open'\r\n usecs : count distribution\r\n 0 -> 1 : 997 |****************************************|\r\n 2 -> 3 : 2 | |\r\n 4 -> 7 : 1 | |\r\n\r\n\r\noperation = 'read_iter'\r\n usecs : count distribution\r\n 0 -> 1 : 1813 |****************************************|\r\n 2 -> 3 : 102 |** |\r\n 4 -> 7 : 14 | |\r\n```\r\n\r\n\r\nSigned-off-by: Wenbo Zhang <ethercflow@gmail.com>ghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="libbpf-tools: add ext4dist" href="https://github.com/iovisor/bcc/pull/3309">PR #3309</a>: libbpf-tools: add ext4dist#91513035767460664bcc-pr #915915false9157315SUCCESS1617250290500https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/915/git915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=fc25/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=fc26/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=fc27/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=fc28/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=ubuntu1604/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=ubuntu1710/915/915https://buildbot.iovisor.org/jenkins/user/tdecacqu/my-views/view/all/job/bcc-pr/label=ubuntu1804/915/