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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>
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.