Merge pull request #25118 from thaJeztah/various-docs-fixes

fix minor docs issues
This commit is contained in:
Sebastiaan van Stijn 2016-07-27 11:27:34 +02:00 committed by GitHub
commit fb7edde4f2
2 changed files with 13 additions and 16 deletions

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@ -139,7 +139,7 @@ indicates the number of page faults which happened since the creation of
the cgroup; this number can never decrease).
- **cache:**
- **cache:**
the amount of memory used by the processes of this control group
that can be associated precisely with a block on a block device.
When you read from and write to files on disk, this amount will
@ -149,16 +149,16 @@ the cgroup; this number can never decrease).
`mmap`). It also accounts for the memory used by
`tmpfs` mounts, though the reasons are unclear.
- **rss:**
- **rss:**
the amount of memory that *doesn't* correspond to anything on disk:
stacks, heaps, and anonymous memory maps.
- **mapped_file:**
- **mapped_file:**
indicates the amount of memory mapped by the processes in the
control group. It doesn't give you information about *how much*
memory is used; it rather tells you *how* it is used.
- **pgfault and pgmajfault:**
- **pgfault and pgmajfault:**
indicate the number of times that a process of the cgroup triggered
a "page fault" and a "major fault", respectively. A page fault
happens when a process accesses a part of its virtual memory space
@ -177,10 +177,10 @@ the cgroup; this number can never decrease).
it just has to duplicate an existing page, or allocate an empty
page, it's a regular (or "minor") fault.
- **swap:**
- **swap:**
the amount of swap currently used by the processes in this cgroup.
- **active_anon and inactive_anon:**
- **active_anon and inactive_anon:**
the amount of *anonymous* memory that has been identified has
respectively *active* and *inactive* by the kernel. "Anonymous"
memory is the memory that is *not* linked to disk pages. In other
@ -195,7 +195,7 @@ the cgroup; this number can never decrease).
retagged "active". When the kernel is almost out of memory, and time
comes to swap out to disk, the kernel will swap "inactive" pages.
- **active_file and inactive_file:**
- **active_file and inactive_file:**
cache memory, with *active* and *inactive* similar to the *anon*
memory above. The exact formula is cache = **active_file** +
**inactive_file** + **tmpfs**. The exact rules used by the kernel
@ -206,14 +206,14 @@ the cgroup; this number can never decrease).
since it can be reclaimed immediately (while anonymous pages and
dirty/modified pages have to be written to disk first).
- **unevictable:**
- **unevictable:**
the amount of memory that cannot be reclaimed; generally, it will
account for memory that has been "locked" with `mlock`.
It is often used by crypto frameworks to make sure that
secret keys and other sensitive material never gets swapped out to
disk.
- **memory and memsw limits:**
- **memory and memsw limits:**
These are not really metrics, but a reminder of the limits applied
to this cgroup. The first one indicates the maximum amount of
physical memory that can be used by the processes of this control
@ -261,21 +261,21 @@ file in the kernel documentation, here is a short list of the most
relevant ones:
- **blkio.sectors:**
- **blkio.sectors:**
contain the number of 512-bytes sectors read and written by the
processes member of the cgroup, device by device. Reads and writes
are merged in a single counter.
- **blkio.io_service_bytes:**
- **blkio.io_service_bytes:**
indicates the number of bytes read and written by the cgroup. It has
4 counters per device, because for each device, it differentiates
between synchronous vs. asynchronous I/O, and reads vs. writes.
- **blkio.io_serviced:**
- **blkio.io_serviced:**
the number of I/O operations performed, regardless of their size. It
also has 4 counters per device.
- **blkio.io_queued:**
- **blkio.io_queued:**
indicates the number of I/O operations currently queued for this
cgroup. In other words, if the cgroup isn't doing any I/O, this will
be zero. Note that the opposite is not true. In other words, if

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@ -1,8 +1,5 @@
<!--[metadata]>
+++
aliases = [
"/engine/swarm/how-swarm-mode-works/"
]
title = "How services work"
description = "How swarm mode services work"
keywords = ["docker, container, cluster, swarm mode, node"]