| created | 2023-02-26T08:55:04Z |
|---|---|
| begin | 2023-02-24T00:00:00Z |
| end | 2023-02-25T00:00:00Z |
| path | src/sys |
| commits | 3 |
| date | 2023-02-24T15:17:48Z | |||
|---|---|---|---|---|
| author | mpi | |||
| files | src/sys/uvm/uvm_map.c | log | diff | annotate |
| message |
Do not held the vm_map lock while flushing pages in msync(2) and madvise(2). Mark the VM map as busy instead to prevent any sibling thread to request an exclusive version of the vm_map. This is necessary to let any PG_BUSY page, found in the UVM vnode object, to be released by a sibling in the middle of a page-fault. Note: the page-fault handler releases & re-grab a shared version of the vm_map lock and expect it to be available to make progress. Prevent a 3-Threads deadlock between msync(2), page-fault and mmap(2). The deadlock reported on bugs@ by many occured as follow: ..ThreadA faults & grabs the shared `vmmaplk' then release it before calling ..uvn_get() which might sleep to allocate pages and mark them as PG_BUSY. ..Once the lock is released, threadB calls uvn_flush(). It sees at least a ..PG_BUSY page and sleeps on the `vmmaplk' waiting for threadA to un-busy ..the page. ..At the same time threadC asked for an exclusive version of the lock and ..sleeps until all reader are done with it. This prevents threadA to ..acquire a shared-version of the lock and finish the page fault. This issue is similar to NetBSD's PR #56952 and the fix is from Chuck Silvers. Tested by many on bugs@, thanks! ok kettenis@ |
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| date | 2023-02-24T23:36:10Z | |||
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| author | aoyama | |||
| files | src/sys/arch/luna88k/stand/Makefile.inc | log | diff | annotate |
| message |
Change to use the default bsd.prog.mk "install" target. This also brings to install boot.8 man page correctly. ok miod@ |
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| date | 2023-02-24T23:36:11Z | |||
|---|---|---|---|---|
| author | aoyama | |||
| files | src/sys/arch/luna88k/stand/boot/Makefile | log | diff | annotate |
| message |
Change to use the default bsd.prog.mk "install" target. This also brings to install boot.8 man page correctly. ok miod@ |
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