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explain extended size classes impact on quarantine

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Daniel Micay 2019-07-05 17:57:41 -04:00
parent 060f74b993
commit 934ab4cb59
1 changed files with 10 additions and 8 deletions
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@ -137,16 +137,18 @@ for the chosen values are not written yet, so use them at your own peril:
* `CONFIG_SLAB_QUARANTINE_RANDOM_LENGTH`: `1` (default) to control the number * `CONFIG_SLAB_QUARANTINE_RANDOM_LENGTH`: `1` (default) to control the number
of slots in the random array used to randomize reuse for small memory of slots in the random array used to randomize reuse for small memory
allocations. This sets the length for the largest size class (currently allocations. This sets the length for the largest size class (either 16kiB
16384) and the quarantine length for smaller size classes is scaled to match or 128kiB based on `CONFIG_EXTENDED_SIZE_CLASSES`) and the quarantine length
the total memory of the quarantined allocations (1 becomes 1024 for 16 byte for smaller size classes is scaled to match the total memory of the
allocations). quarantined allocations (1 becomes 1024 for 16 byte allocations with 16kiB
as the largest size class, or 8192 with 128kiB as the largest).
* `CONFIG_SLAB_QUARANTINE_QUEUE_LENGTH`: `1` (default) to control the number of * `CONFIG_SLAB_QUARANTINE_QUEUE_LENGTH`: `1` (default) to control the number of
slots in the queue used to delay reuse for small memory allocations. This slots in the queue used to delay reuse for small memory allocations. This
sets the length for the largest size class (currently 16384) and the sets the length for the largest size class (either 16kiB or 128kiB based on
quarantine length for smaller size classes is scaled to match the total `CONFIG_EXTENDED_SIZE_CLASSES`) and the quarantine length for smaller size
memory of the quarantined allocations (1 becomes 1024 for 16 byte classes is scaled to match the total memory of the quarantined allocations (1
allocations). becomes 1024 for 16 byte allocations with 16kiB as the largest size class, or
8192 with 128kiB as the largest).
* `CONFIG_GUARD_SLABS_INTERVAL`: `1` (default) to control the number of slabs * `CONFIG_GUARD_SLABS_INTERVAL`: `1` (default) to control the number of slabs
before a slab is skipped and left as an unused memory protected guard slab before a slab is skipped and left as an unused memory protected guard slab
* `CONFIG_GUARD_SIZE_DIVISOR`: `2` (default) to control the maximum size of the * `CONFIG_GUARD_SIZE_DIVISOR`: `2` (default) to control the maximum size of the