GitHub pull request #3279 of commit 76d87225052e13f919500be778676b9182735e1a, no merge conflicts.sha1origin/pr/3279/mergeghprbActualCommit76d87225052e13f919500be778676b9182735e1aghprbActualCommitAuthorYonghong SongghprbActualCommitAuthorEmailyhs@fb.comghprbAuthorRepoGitUrlhttps://github.com/iovisor/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginghprbTriggerAuthorLoginMentionghprbPullId3279ghprbTargetBranchmasterghprbSourceBranchyhs_devGIT_BRANCHyhs_devghprbPullAuthorEmailghprbPullAuthorLoginyonghong-songghprbPullAuthorLoginMention@yonghong-songghprbPullDescriptionGitHub pull request #3279 of commit 76d87225052e13f919500be778676b9182735e1a, no merge conflicts.ghprbPullTitleAllow python usdt attachment with pid -1ghprbPullLinkhttps://github.com/iovisor/bcc/pull/3279ghprbPullLongDescriptionFor usdt with semaphore, user needs to provide pid in order\r\nto create a usdt since enabling semaphore requires write to\r\nvirtual memory of the user process.\r\n\r\nFor attachment to corresponding usdt uprobe, we can pass\r\nvalid pid to perf_event_open() syscall so usdt is only\r\ntriggered for this process, or pass pid -1 permits usdt is\r\nto triggered for all processes.\r\n\r\nThere are use cases for usdt to be triggered for other\r\nprocesses than just one process. For example, for python\r\nusdt function__entry/function__return, users may want to\r\ntrace usdt of a particular python process and all its\r\nchildren processes.\r\n\r\nC++ already has API to permit ignoring pid during attachment.\r\n attach_usdt(const USDT& usdt, pid_t pid = -1)\r\nThis patch added similar functionality to python with an\r\nadditional parameter to BPF constructor to indicate whether\r\nattach_usdt can ignore pid or not.\r\n\r\nSigned-off-by: Yonghong Song <yhs@fb.com>ghprbCommentBodynullghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="Allow python usdt attachment with pid -1" href="https://github.com/iovisor/bcc/pull/3279">PR #3279</a>: Allow python usdt attachmen...#85511373877460664bcc-pr #855855false8556849SUCCESS1614018079002https://buildbot.iovisor.org/jenkins/job/bcc-pr/855/git855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc25/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc26/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc27/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc28/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1604/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1710/855/855https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1804/855/