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| author | Wei Yang <richardw.yang@linux.intel.com> | 2019-08-06 08:46:47 +0800 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2019-08-14 17:33:14 +0100 |
| commit | dad45ab2be9d5ce033ddba328204b06f2d10f0ed (patch) | |
| tree | 947efdd42eac7046c0475728365e9c82e75a0c19 /exec.c | |
| parent | 810cf2bbd4c5c1417bda8bec49caf0ababc22860 (diff) | |
migration/postcopy: simplify calculation of run_start and fixup_start_addr
The purpose of the calculation is to find a HostPage which is partially
dirty.
* fixup_start_addr points to the start of the HostPage to discard
* run_start points to the next HostPage to check
While in the middle stage, there would two cases for run_start:
* aligned with HostPage means this is not partially dirty
* not aligned means this is partially dirty
When it is aligned, no work and calculation is necessary. run_start
already points to the start of next HostPage and is ready to continue.
When it is not aligned, the calculation could be simplified with:
* fixup_start_addr = QEMU_ALIGN_DOWN(run_start, host_ratio)
* run_start = QEMU_ALIGN_UP(run_start, host_ratio)
By doing so, run_start always points to the next HostPage to check.
fixup_start_addr always points to the HostPage to discard.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190806004648.8659-2-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'exec.c')
0 files changed, 0 insertions, 0 deletions