A few simplifications for softdirty memory tracker code
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- v1 Latest2 patches 3 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | mm: pgtable -- Drop unneeded preprocessor ifdefarch/ arch/ | +0 | 0 replies | |
| 2/2 | mm: pgtable -- Require X86_64 for soft-dirty trackerarch/ arch/ | +1 | 4 replies |
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Cover letter [patch 0/2] A few simplifications for softdirty memory tracker code
Hi, here are a few simplifications for softdirty memory tracker code, in particular we dropped off x86-32 support since it seems noone needed it here on x86 platform.
As Andrew requested I've rebased patches on top of current linux-next repo.
Also at first I wanted to rip off _PAGE_PSE bit which we use in swap ptes to track dirty status of swapped pages and reuse _PAGE_BIT_SOFT_DIRTY instead. It's still possible but requires additional shrinking of maximal swap size and I don't know if it's acceptible or not. Currently we have
#ifdef CONFIG_NUMA_BALANCING
/* Automatic NUMA balancing needs to be distinguishable from swap entries */ #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 2)
#else
#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
#endif
If I reuse _PAGE_BIT_SOFT_DIRTY I'll have to increase this shift up to bit 11, which, again, I think is too much, right?
Comments are highly appreciated!
Cyrill
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