Date: Sun, 08 Mar 2015 17:51:44 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 198431] Vnode info not provided for memory mapped tmpfs files in various places Message-ID: <bug-198431-8@https.bugs.freebsd.org/bugzilla/>
next in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198431 Bug ID: 198431 Summary: Vnode info not provided for memory mapped tmpfs files in various places Product: Base System Version: 10.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: eric@badgerio.us Created attachment 154029 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154029&action=edit Proposed patch Since r250030, when a superfluous VM object for tmpfs VREG files was eliminated, various interfaces (e.g. procfs, KERN_PROC sysctl) that return info about memory maps for processes stopped returning vnode info for tmpfs files. Instead, the mappings would appear as swap type with no further detail. This prevents tools using this information (e.g. dtrace's pid provider) from working correctly. Attached a proposed patch. It will, in cases where a VM object with type OBJT_SWAP and OBJ_TMPFS flag is found, populate the vnode pointer appropriately so the vnode information can be extracted. It will also (where applicable) set the memory mapping to appear as a vnode type (this matches FreeBSD 9 behavior, and, per advice from jhb@ and kib@, is desirable because it hides implementation details). In the case where the VM object has the OBJ_TMPFS_NODE but not OBJ_TMPFS flag (i.e. vnode has been recycled), the mapping is still returned as a vnode type, but the vnode pointer is not populated. The proposed patch covers procstat (-v), procfs, linprocfs, pmc (pmcstat), and ptrace (PT_VM_ENTRY). -- You are receiving this mail because: You are the assignee for the bug.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-198431-8>