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Documentation: fix the VM knobs descritpion WRT pdflush

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The pdflush thread is long gone, however we still mention it incorrectly in the
kernel documentation. This patch fixes the situation.

Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Artem Bityutskiy 2012-07-25 18:12:01 +03:00 committed by Al Viro
parent 34e5053fbe
commit 6601fac822
2 changed files with 13 additions and 13 deletions
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12
Documentation/laptops/laptop-mode.txt
View file

@ -262,9 +262,9 @@ MINIMUM_BATTERY_MINUTES=10
# #
# Allowed dirty background ratio, in percent. Once DIRTY_RATIO has been # Allowed dirty background ratio, in percent. Once DIRTY_RATIO has been
# exceeded, the kernel will wake pdflush which will then reduce the amount # exceeded, the kernel will wake flusher threads which will then reduce the
# of dirty memory to dirty_background_ratio. Set this nice and low, so once # amount of dirty memory to dirty_background_ratio. Set this nice and low,
# some writeout has commenced, we do a lot of it. # so once some writeout has commenced, we do a lot of it.
# #
#DIRTY_BACKGROUND_RATIO=5 #DIRTY_BACKGROUND_RATIO=5
@ -384,9 +384,9 @@ CPU_MAXFREQ=${CPU_MAXFREQ:-'slowest'}
# #
# Allowed dirty background ratio, in percent. Once DIRTY_RATIO has been # Allowed dirty background ratio, in percent. Once DIRTY_RATIO has been
# exceeded, the kernel will wake pdflush which will then reduce the amount # exceeded, the kernel will wake flusher threads which will then reduce the
# of dirty memory to dirty_background_ratio. Set this nice and low, so once # amount of dirty memory to dirty_background_ratio. Set this nice and low,
# some writeout has commenced, we do a lot of it. # so once some writeout has commenced, we do a lot of it.
# #
DIRTY_BACKGROUND_RATIO=${DIRTY_BACKGROUND_RATIO:-'5'} DIRTY_BACKGROUND_RATIO=${DIRTY_BACKGROUND_RATIO:-'5'}

14
Documentation/sysctl/vm.txt
View file

@ -76,8 +76,8 @@ huge pages although processes will also directly compact memory as required.
dirty_background_bytes dirty_background_bytes
Contains the amount of dirty memory at which the pdflush background writeback Contains the amount of dirty memory at which the background kernel
daemon will start writeback. flusher threads will start writeback.
Note: dirty_background_bytes is the counterpart of dirty_background_ratio. Only Note: dirty_background_bytes is the counterpart of dirty_background_ratio. Only
one of them may be specified at a time. When one sysctl is written it is one of them may be specified at a time. When one sysctl is written it is
@ -89,7 +89,7 @@ other appears as 0 when read.
dirty_background_ratio dirty_background_ratio
Contains, as a percentage of total system memory, the number of pages at which Contains, as a percentage of total system memory, the number of pages at which
the pdflush background writeback daemon will start writing out dirty data. the background kernel flusher threads will start writing out dirty data.
============================================================== ==============================================================
@ -112,9 +112,9 @@ retained.
dirty_expire_centisecs dirty_expire_centisecs
This tunable is used to define when dirty data is old enough to be eligible This tunable is used to define when dirty data is old enough to be eligible
for writeout by the pdflush daemons. It is expressed in 100'ths of a second. for writeout by the kernel flusher threads. It is expressed in 100'ths
Data which has been dirty in-memory for longer than this interval will be of a second. Data which has been dirty in-memory for longer than this
written out next time a pdflush daemon wakes up. interval will be written out next time a flusher thread wakes up.
============================================================== ==============================================================
@ -128,7 +128,7 @@ data.
dirty_writeback_centisecs dirty_writeback_centisecs
The pdflush writeback daemons will periodically wake up and write `old' data The kernel flusher threads will periodically wake up and write `old' data
out to disk. This tunable expresses the interval between those wakeups, in out to disk. This tunable expresses the interval between those wakeups, in
100'ths of a second. 100'ths of a second.