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[PATCH v2 0/2] migration: faster savevm_state_handler_insert()
From: |
Scott Cheloha |
Subject: |
[PATCH v2 0/2] migration: faster savevm_state_handler_insert() |
Date: |
Thu, 17 Oct 2019 15:59:51 -0500 |
The savevm_state.handlers queue of SaveStateEntry objects is a
priority queue with an O(n) insertion cost. This is makes startup
extremely slow when a VM has many such objects to register. For
instance, a ppc64 VM with a large (8T+) maxmem needs to register tens
of thousands of SaveStateEntry handlers: startup for these VMs is
glacial.
If we track insertion points within the priority queue we can make
savevm_state_handler_insert() a constant-time operation with little
change to the module's code. Startup times for VMs with many handlers
are dramatically improved as a result.
Changes since v1:
* Split patch 1 into 2 patches.
Scott Cheloha (2):
migration: add savevm_state_handler_remove()
migration: savevm_state_handler_insert: constant-time element
insertion
migration/savevm.c | 35 ++++++++++++++++++++++++++++++-----
1 file changed, 30 insertions(+), 5 deletions(-)
--
2.23.0
- [PATCH v2 0/2] migration: faster savevm_state_handler_insert(),
Scott Cheloha <=
- [PATCH v2 1/2] migration: add savevm_state_handler_remove(), Scott Cheloha, 2019/10/17
- [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Scott Cheloha, 2019/10/17
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Dr. David Alan Gilbert, 2019/10/18
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Laurent Vivier, 2019/10/18
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Dr. David Alan Gilbert, 2019/10/18
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Michael Roth, 2019/10/18
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Dr. David Alan Gilbert, 2019/10/18
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, David Gibson, 2019/10/21
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, David Gibson, 2019/10/19
- Re: [PATCH v2 2/2] migration: savevm_state_handler_insert: constant-time element insertion, Dr. David Alan Gilbert, 2019/10/21