docs/vm: balance: convert to ReST format
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
parent
438b8e24d1
commit
d04f9f5a78
|
@ -1,3 +1,9 @@
|
||||||
|
.. _balance:
|
||||||
|
|
||||||
|
================
|
||||||
|
Memory Balancing
|
||||||
|
================
|
||||||
|
|
||||||
Started Jan 2000 by Kanoj Sarcar <kanoj@sgi.com>
|
Started Jan 2000 by Kanoj Sarcar <kanoj@sgi.com>
|
||||||
|
|
||||||
Memory balancing is needed for !__GFP_ATOMIC and !__GFP_KSWAPD_RECLAIM as
|
Memory balancing is needed for !__GFP_ATOMIC and !__GFP_KSWAPD_RECLAIM as
|
||||||
|
@ -62,11 +68,11 @@ for non-sleepable allocations. Second, the HIGHMEM zone is also balanced,
|
||||||
so as to give a fighting chance for replace_with_highmem() to get a
|
so as to give a fighting chance for replace_with_highmem() to get a
|
||||||
HIGHMEM page, as well as to ensure that HIGHMEM allocations do not
|
HIGHMEM page, as well as to ensure that HIGHMEM allocations do not
|
||||||
fall back into regular zone. This also makes sure that HIGHMEM pages
|
fall back into regular zone. This also makes sure that HIGHMEM pages
|
||||||
are not leaked (for example, in situations where a HIGHMEM page is in
|
are not leaked (for example, in situations where a HIGHMEM page is in
|
||||||
the swapcache but is not being used by anyone)
|
the swapcache but is not being used by anyone)
|
||||||
|
|
||||||
kswapd also needs to know about the zones it should balance. kswapd is
|
kswapd also needs to know about the zones it should balance. kswapd is
|
||||||
primarily needed in a situation where balancing can not be done,
|
primarily needed in a situation where balancing can not be done,
|
||||||
probably because all allocation requests are coming from intr context
|
probably because all allocation requests are coming from intr context
|
||||||
and all process contexts are sleeping. For 2.3, kswapd does not really
|
and all process contexts are sleeping. For 2.3, kswapd does not really
|
||||||
need to balance the highmem zone, since intr context does not request
|
need to balance the highmem zone, since intr context does not request
|
||||||
|
@ -89,7 +95,8 @@ pages is below watermark[WMARK_LOW]; in which case zone_wake_kswapd is also set.
|
||||||
|
|
||||||
|
|
||||||
(Good) Ideas that I have heard:
|
(Good) Ideas that I have heard:
|
||||||
|
|
||||||
1. Dynamic experience should influence balancing: number of failed requests
|
1. Dynamic experience should influence balancing: number of failed requests
|
||||||
for a zone can be tracked and fed into the balancing scheme (jalvo@mbay.net)
|
for a zone can be tracked and fed into the balancing scheme (jalvo@mbay.net)
|
||||||
2. Implement a replace_with_highmem()-like replace_with_regular() to preserve
|
2. Implement a replace_with_highmem()-like replace_with_regular() to preserve
|
||||||
dma pages. (lkd@tantalophile.demon.co.uk)
|
dma pages. (lkd@tantalophile.demon.co.uk)
|
||||||
|
|
Loading…
Reference in New Issue