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Diffstat (limited to 'results/scraper/fex/3948')
| -rw-r--r-- | results/scraper/fex/3948 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/results/scraper/fex/3948 b/results/scraper/fex/3948 new file mode 100644 index 000000000..979fa0ab1 --- /dev/null +++ b/results/scraper/fex/3948 @@ -0,0 +1,11 @@ +Cross-process tear free split-lock emulation can't be implemented without kernel support (or TME) +In order to correctly handle split-lock emulation, we need a global mutex. We could easily get this through FEXServer handing a shared page to all FEXInterpreter instances. + +The problem with this is that if a process dies when one of its threads is handling a split-lock (Or cross-16byte boundary atomic) then the mutex will be permanently set. Effectively hanging every running FEXInterpreter process on the system. + +There's no way to work around this in a tear-free fashion and also never have hangs. It /needs/ to be done in the kernel. + +The "alternative" and preferred approach would be if all ARM vendors just support TME, but that's never going to occur. + +As for starting the discussion with the ARM kernel maintainers for getting this supported upstream... + |