From: Robert Foss <robert.foss@xxxxxxxxxxxxx>
This series provides the /proc/PID/totmaps feature, which
summarizes the information provided by /proc/PID/smaps for
improved performance and usability reasons.
A use case is to speed up monitoring of memory consumption in
environments where RSS isn't precise.
For example Chrome tends to many processes which have hundreds of VMAs
with a substantial amount of shared memory, and the error of using
RSS rather than PSS tends to be very large when looking at overall
memory consumption. PSS isn't kept as a single number that's exported
like RSS, so to calculate PSS means having to parse a very large smaps
file.
This process is slow and has to be repeated for many processes, and we
found that the just act of doing the parsing was taking up a
significant amount of CPU time, so this patch is an attempt to make
that process cheaper.
/proc/PID/totmaps provides roughly a 2x speedup compared to parsing
/proc/PID/smaps with awk.
$ /usr/bin/time -v -p zsh -c "(repeat 25 {cat /proc/5025/totmaps})"
[...]
Command being timed: "zsh -c (repeat 25 {cat /proc/5025/totmaps})"
User time (seconds): 0.00
System time (seconds): 0.40
Percent of CPU this job got: 90%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.45
$ /usr/bin/time -v -p zsh -c "repeat 25 { awk '/^Rss/{rss+=\$2} /^Pss/{pss+=\$2} END {printf \"rss:%d pss:%d\n\", rss, pss}\' /proc/5025/smaps}"
[...]
Command being timed: "zsh -c repeat 25 { awk '/^Rss/{rss+=$2}
/^Pss/{pss+=$2} END {printf "rss:%d pss:%d\n", rss, pss}\' /proc/5025/smaps }"
User time (seconds): 0.37
System time (seconds): 0.45
Percent of CPU this job got: 92%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.89
Robert Foss (3):
mm, proc: Implement /proc/<pid>/totmaps
Documentation/filesystems: Fixed typo
Documentation/filesystems: Added /proc/PID/totmaps documentation
Documentation/filesystems/proc.txt | 23 ++++++-
fs/proc/base.c | 1 +
fs/proc/internal.h | 2 +
fs/proc/task_mmu.c | 129 +++++++++++++++++++++++++++++++++++++
4 files changed, 154 insertions(+), 1 deletion(-)
--
2.7.4
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