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Line 16: − − === Shared memory dump === − − When dumping a vma for a task its consents is dumped regardless of whether a mapping is shared. Thus for e.g. 2 tasks with shared region we'll have 2 images with the same contents. − − Another problem is that a shared memory region may have different mincore() reports from different tasks. Thus neither of them is suitable for dumping the shmem with current technique. − − === Mincore report is bad === − − The existing mincore bit is not enough for several reasons. − − # Swapped out memory is not reported and this is a BUG. Plan is to propose the MINCORE_SWAP bit. − # File pages are reported as present if they are in page cache regardless of whether they are mapped or not. − # When a page from private file mapping is not cow-ed (i.e. was read only) it's not necessary to dump it. − +
→Problems
== Problems ==
== Problems ==
=== Non linear mappings ===
=== Non linear mappings ===
Currently there's no way to detect this mapping and dump one carefully.
Currently we don't support non-linear mappings (fail dump if present)