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IO usages are accounted in foreground and background buckets.
For each uid, io usage is calculated in two steps.
delta = current total of all uid tasks - previus total
current bucket += delta
Bucket is determined by current uid stat. Userspace writes to
/proc/uid_procstat/set <uid> <stat> when uid stat is updated.
/proc/uid_io/stats shows IO usage in this format.
<uid> <foreground IO> <background IO>
Bug: 34198239
Bug: 120442023
Change-Id: Ib8bebda53e7a56f45ea3eb0ec9a3153d44188102
Signed-off-by: Jin Qian <jinqian@google.com>
[connoro: Used by storaged.]
[astrachan: Note: this version does not track fsync syscalls; this is
implemented in a follow up due to the fact it depends on
modifications to the task_xacct feature.]
[astrachan: Folded in the following changes:
e003a91d8f42 ("ANDROID: uid_sys_stats: allow writing same state")
89b984bf2efd ("ANDROID: uid_sys_stats: fix negative write bytes.")
bb5ee21cc4dd ("ANDROID: uid_sys_stats: change to use rt_mutex")
9297d5a160c7 ("ANDROID: uid_sys_stats: reduce update_io_stats overhead")
89402d07fe91 ("ANDROID: uid_sys_stats: defer io stats calulation for dead tasks")
6dc5d8173a8c ("ANDROID: uid_sys_stats: check previous uid_entry before call find_or_register_uid")
0ca2ece8f7ec ("ANDROID: uid_sys_stats: log task io with a debug flag")
c9c096ef0e67 ("ANDROID: uid_sys_stats: Copy task_struct comm field to bigger buffer")]
Signed-off-by: Alistair Strachan <astrachan@google.com>
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| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| build.config.cuttlefish.aarch64 | ||
| build.config.cuttlefish.x86_64 | ||
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.