[DragonFlyBSD - Bug #2869] (New) hammer2 vs ccache: process hanging in chnmem state

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2869 has been reported by arcade at b1t.name.

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Bug #2869: hammer2 vs ccache: process hanging in chnmem state
http://bugs.dragonflybsd.org/issues/2869

* Author: arcade at b1t.name
* Status: New
* Priority: Low
* Assignee: 
* Category: VFS subsystem
* Target version: 
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As I came from FreeBSD I already faced ccache a little over ZFS. When ccache is almost full it starts freeing space, and when it does so (on ZFS) it stucks in zio->* state for a long time perusing disk.

HAMMER2 behaves very bad in this case too:
 * we have free mem (like 600Mb);
 * ccache hangs in chnmem state;
 * disk is idle;
 * writes are heavily penalized, disk is slow;
 * console is full of:

Dec 18 22:16:25  kernel: Warning: cache_resolve: ncp '4cfd2287d50b992cca713202e76553-14712.manifest.rm..474328.XXXXXX' was unlinked
Dec 18 22:16:25  kernel: kern_rename: retry due to gen on: "4cfd2287d50b992cca713202e76553-14712.manifest.rm..474328.XXXXXX" -> "4cfd2287d50b992cca713202e76553-14712.manifest.rm..474377.XXXXXX"
Dec 18 22:16:25  kernel: Warning: cache_resolve: ncp '1afbb983f96488451e95ae9de240a4-87227.o.rm..474856.XXXXXX' was unlinked
Dec 18 22:16:25  kernel: kern_rename: retry due to gen on: "1afbb983f96488451e95ae9de240a4-87227.o.rm..474856.XXXXXX" -> "1afbb983f96488451e95ae9de240a4-87227.o.rm..474352.XXXXXX"
Dec 18 22:16:34  kernel: Warning: cache_resolve: ncp '8dc566823e04be58a3e8dab71cba61-68692.o.rm..474856.XXXXXX' was unlinked
Dec 18 22:16:34  kernel: kern_rename: retry due to gen on: "8dc566823e04be58a3e8dab71cba61-68692.o.rm..474856.XXXXXX" -> "8dc566823e04be58a3e8dab71cba61-68692.o.rm..474352.XXXXXX"
Dec 18 22:16:42  kernel: [diagnostic] cache_lock_shared: blocked on 0xffffffe10a97e430 00000001 "8dc566823e04be58a3e8dab71cba61-68692.d.rm..474856.XXXXXX"
Dec 18 22:16:42  kernel: [diagnostic] cache_lock: blocked on 0xffffffe108d04120 00000001 "efc494c16cb3457c3e959e4e44e51e-3156639.o.rm..474328.XXXXXX"
Dec 18 22:16:42  kernel: [diagnostic] cache_lock_shared: unblocked 8dc566823e04be58a3e8dab71cba61-68692.d.rm..474856.XXXXXX after 0 secs
Dec 18 22:16:42  kernel: [diagnostic] cache_lock: unblocked efc494c16cb3457c3e959e4e44e51e-3156639.o.rm..474328.XXXXXX after 8 secs
Dec 18 22:16:42  kernel: Warning: cache_resolve: ncp 'efc494c16cb3457c3e959e4e44e51e-3156639.o.rm..474328.XXXXXX' was unlinked
Dec 18 22:16:42  kernel: kern_rename: retry due to gen on: "efc494c16cb3457c3e959e4e44e51e-3156639.o.rm..474328.XXXXXX" -> "efc494c16cb3457c3e959e4e44e51e-3156639.o.rm..474377.XXXXXX"
Dec 18 22:16:47  kernel: Warning: cache_resolve: ncp 'c4bd7d4813f22726c2b45f6c8b7053-25838.manifest.rm..474856.XXXXXX' was unlinked
Dec 18 22:16:47  kernel: kern_rename: retry due to gen on: "c4bd7d4813f22726c2b45f6c8b7053-25838.manifest.rm..474856.XXXXXX" -> "c4bd7d4813f22726c2b45f6c8b7053-25838.manifest.rm..474352.XXXXXX"
Dec 18 22:17:01  kernel: Warning: cache_resolve: ncp '0ce9bbd7190adeccf1db7e582ff7d4-12275.manifest.rm..474352.XXXXXX' was unlinked




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