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docs: cgroup-v1: make swap extension subsections subsections
Subsections text of swap extension section is marked up as bold text, whereas making them proper subsection is more appropriate. Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -244,7 +244,8 @@ In this case, setting memsw.limit_in_bytes=3G will prevent bad use of swap.
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By using the memsw limit, you can avoid system OOM which can be caused by swap
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By using the memsw limit, you can avoid system OOM which can be caused by swap
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shortage.
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shortage.
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**why 'memory+swap' rather than swap**
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2.4.1 why 'memory+swap' rather than swap
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The global LRU(kswapd) can swap out arbitrary pages. Swap-out means
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The global LRU(kswapd) can swap out arbitrary pages. Swap-out means
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to move account from memory to swap...there is no change in usage of
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to move account from memory to swap...there is no change in usage of
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@ -252,7 +253,8 @@ memory+swap. In other words, when we want to limit the usage of swap without
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affecting global LRU, memory+swap limit is better than just limiting swap from
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affecting global LRU, memory+swap limit is better than just limiting swap from
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an OS point of view.
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an OS point of view.
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**What happens when a cgroup hits memory.memsw.limit_in_bytes**
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2.4.2. What happens when a cgroup hits memory.memsw.limit_in_bytes
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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When a cgroup hits memory.memsw.limit_in_bytes, it's useless to do swap-out
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When a cgroup hits memory.memsw.limit_in_bytes, it's useless to do swap-out
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in this cgroup. Then, swap-out will not be done by cgroup routine and file
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in this cgroup. Then, swap-out will not be done by cgroup routine and file
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