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--- tmpfs [2007/07/05 15:52] – HowardSu
+++ tmpfs [2022/09/19 01:33] (current) – Remove ACL: not 'devs only' for a long time, all:read is already default. Add Intro & move ToC KubilayKocak
@@ Line 1: / Line 1: @@
-&t##language:en #acl DevelopersGroup:read,write,admin,delete,revert ContributorsGroup:read,write,admin,delete,revert All:read [[TableOfContents()|TableOfContents()]]
+====== TMPFS (Temporary Filesystem) ======
-----
+====== Introduction ======
-TMPFS is now in -Current tree under /src/sys/fs/tmpfs.
+%%TmpFS%% was first developed by Julio M. Merino Vidal for %%NetBSD%% as a %%SoC%% project: [[http://netbsd-soc.sourceforge.net/projects/tmpfs/|Efficient memory file-system]]. Rohit Jalan ported it from %%NetBSD%% to %%FreeBSD%%. Now HowardSu and Glen Leeder (<glen.leeder@nokia.com> ) and XinLi are working on it to continue this effort.
-====== Porting TMPFS ======
+====== Using TMPFS ======
-%%TmpFS%% is first developed by Julio M. Merino Vidal for %%NetBSD%% as a %%SoC%% project: [http://netbsd-soc.sourceforge.net/projects/tmpfs/ Efficient memory file-system]. Rohit Jalan ported it from %%NetBSD%% to %%FreeBSD%%. Now HowardSu and Glen Leeder ( glen.leeder@nokia.com ) are working on it to continue this effort.
+tmpfs is included in Release since 7-Release. A typical usage is use tmpfs as /tmp mount point.
+  - Change the /tmp mount point in /etc/fstab to: **tmpfs  /tmp  tmpfs  rw,mode=777  0  0**
+  - **umount /tmp**
+  - **mount /tmp**
+====== TODO ======
+  * Refine and improve locking.
+  * Support unionfs, tmpfs can be used as an upper filesystem.
+  * Extra attribute support
+====== Testing Status ======
+===== Regression Testing =====
-==== Regression Testing ====
 We port %%NetBSD%% regression test cases.
-All tests sucessful.
+All tests successful.
+===== POSIX Correctness Testing =====
-==== POSIX Correctness Testing ====
 All tests successful.
 Files=184, Tests=3353, 823 wallclock secs (29.94 cusr + 368.38 csys = 398.31 CPU)
-==== Stress Testing ====
+===== Stress Testing =====
 Survive after fsstress -n 10000 -p 50. Tested under AMD64/i386.
-Any presure testing in SMP box are highly welcomed.
+Any pressure testing in SMP box are highly welcomed.
-==== Buildworld testing ====
+===== Buildworld testing =====
-We sucessfully build world to a tmpfs in 4-CPU box with -j32.
-==== fsx Testing ====
+We successfully build world to a tmpfs in 4-CPU box with -j32.
-fsx(tools/regression/fsx) is a tool to test the correctness of a filesystem read/write. It tests read, write, truncate, mmapread, mmapwrite, hole/extend write. TMPFS failed the testing with two problems:
-. The hole create by truncate or extend write is not zeroed correctly.
-. Some write data will lost due to unknow issue.
-I suppose all these bugs are related to the fact that for each file, tmpfs maintain two objects (one vnode object in vnode->v_obj, one swap object in tmpfs_node-;tn_obj). The data transfered between two objects are buggy (tmpfs_uio_xfer function in tmpfs_vnops.c). Any help are highly apprecaited.
+===== fsx Testing =====
+fsx(tools/regression/fsx) is a tool to test the correctness of a filesystem read/write. It tests read, write, truncate, mmapread, mmapwrite, hole/extend write.
+We passed fsx testing now.
+===== Performance Testing =====
-==== Performance Testing ====
 The vacache code is removed. sf_buf is used for data I/O. The performance will depends on sf_buf implementation in different platform. In Amd64, sf_buf is zero copy however i386 is not. So you will notice a performance difference.
+----
+{{tag>Stale}}