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Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj |
Date: |
Thu, 09 Aug 2012 09:49:24 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 |
Il 09/08/2012 09:33, liu ping fan ha scritto:
> Yes, it is to defer destructors.
> See 0009-memory-prepare-flatview-and-radix-tree-for-rcu-style.patch
> When MemoryRegion is _del_subregion from mem in updater, it may be
> still in use by reader -- radix or flatview, so defer its destructors
> to the reclaimer --phys_map_release(PhysMap *map)
How are you sure that the reader is already out of its critical section
by the time the reclaimer runs?
> If we have rcu, it could be elegant to do this.
Yeah, I think inventing primitives is dangerous and difficult to review;
and it may be difficult to replace it with proper call_rcu.
You should probably make a proof-of-concept using liburcu. Then we can
decide how to implement RCU in a way that is portable enough for QEMU's
needs.
Paolo
- Re: [Qemu-devel] [PATCH 01/15] atomic: introduce atomic operations, (continued)
[Qemu-devel] [PATCH 02/15] qom: using atomic ops to re-implement object_ref, Liu Ping Fan, 2012/08/08
[Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Liu Ping Fan, 2012/08/08
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Avi Kivity, 2012/08/08
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Paolo Bonzini, 2012/08/08
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Avi Kivity, 2012/08/08
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, liu ping fan, 2012/08/09
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Avi Kivity, 2012/08/09
- Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, liu ping fan, 2012/08/10
Re: [Qemu-devel] [PATCH 03/15] qom: introduce reclaimer to release obj, Paolo Bonzini, 2012/08/08
[Qemu-devel] [PATCH 04/15] memory: MemoryRegion topology must be stable when updating, Liu Ping Fan, 2012/08/08