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| /freebsd-10.1-release/sys/nfsclient/ | ||
| H A D | nfs_node.c | diff 138469 Mon Dec 06 16:52:28 MST 2004 ps Serialize NFS vinvalbuf operations by acquiring/upgrading to the vnode EXCLUSIVE lock. This prevents threads from adding pages to the vnode while an invalidation is in progress, closing potential races. In the bioread() path, callers acquire the SHARED vnode lock - so while an invalidate was in progress, it was possible to fault in new pages onto the vnode causing the invalidation to take a while or fail. We saw these races at Yahoo! with very large files+heavy concurrent access. Forcing an upgrade to EXCLUSIVE lock before doing the invalidation closes all these races. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com |
| H A D | nfsnode.h | diff 138469 Mon Dec 06 16:52:28 MST 2004 ps Serialize NFS vinvalbuf operations by acquiring/upgrading to the vnode EXCLUSIVE lock. This prevents threads from adding pages to the vnode while an invalidation is in progress, closing potential races. In the bioread() path, callers acquire the SHARED vnode lock - so while an invalidate was in progress, it was possible to fault in new pages onto the vnode causing the invalidation to take a while or fail. We saw these races at Yahoo! with very large files+heavy concurrent access. Forcing an upgrade to EXCLUSIVE lock before doing the invalidation closes all these races. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com |
| H A D | nfs_bio.c | diff 138469 Mon Dec 06 16:52:28 MST 2004 ps Serialize NFS vinvalbuf operations by acquiring/upgrading to the vnode EXCLUSIVE lock. This prevents threads from adding pages to the vnode while an invalidation is in progress, closing potential races. In the bioread() path, callers acquire the SHARED vnode lock - so while an invalidate was in progress, it was possible to fault in new pages onto the vnode causing the invalidation to take a while or fail. We saw these races at Yahoo! with very large files+heavy concurrent access. Forcing an upgrade to EXCLUSIVE lock before doing the invalidation closes all these races. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com |
| H A D | nfs_vnops.c | diff 138469 Mon Dec 06 16:52:28 MST 2004 ps Serialize NFS vinvalbuf operations by acquiring/upgrading to the vnode EXCLUSIVE lock. This prevents threads from adding pages to the vnode while an invalidation is in progress, closing potential races. In the bioread() path, callers acquire the SHARED vnode lock - so while an invalidate was in progress, it was possible to fault in new pages onto the vnode causing the invalidation to take a while or fail. We saw these races at Yahoo! with very large files+heavy concurrent access. Forcing an upgrade to EXCLUSIVE lock before doing the invalidation closes all these races. Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com |
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