The graphics shared memory block (shared between the middleman process and all child processes) is used to transmit graphics data to the middleman when a child process is painting. Currently, this memory is included in memory snapshots, so when one child is restoring a checkpoint it can race with other processes that are trying to transmit different graphics data. This has been causing some graphics artifacts when rewinding. There is no reason to include this memory in snapshots, since it is only used in the above case, so this patch excludes this memory from snapshots.
Attachment #8995715 - Flags: review?(nfroyd)
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/ea2290c53efc Exclude graphics shared memory contents from snapshots, r=froydnj.
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