Bug 1118274
| Summary: | /proc/pid/stat utime & guest_time do not match | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Markus Stockhausen <mst> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED UPSTREAM | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 20 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2014-07-10 11:57:54 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Please report this to the upstream kernel maintainers. This is a low priority issue and we aren't going to have time to get to it. |
Description of problem: qemu process values of utime and guest_time in /proc/pid/stat do not match. According to "man proc": utime %lu (14) Amount of time that this process has been scheduled in user mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK)). This includes guest time, guest_time (time spent running a virtual CPU, see below), so that applications that are not aware of the guest time field do not lose that time from their calculations. guest_time %lu (since Linux 2.6.24) (43) Guest time of the process (time spent running a virtual CPU for a guest operating system), measured in clock ticks (divide by sysconf(_SC_CLK_TCK)). Thus increasing values in field 43 (guest_time) should also show up as increasing values in field 14 (utime). Version-Release number of selected component (if applicable): Fedora 20 Kernel 3.14.7-200.fc20.x86_64 How reproducible: unknown. A the moment one process affected Steps to Reproduce: 1. Determine qemu PID ps -e | grep qemu 306 ? 3-07:37:18 qemu-system-x86 8299 ? 1-04:56:39 qemu-system-x86 14444 ? 1-04:58:41 qemu-system-x86 17618 ? 1-14:30:31 qemu-system-x86 19532 ? 1-11:02:46 qemu-system-x86 21794 ? 1-08:51:17 qemu-system-x86 32508 ? 7-14:57:01 qemu-system-x86 2. show /proc/pid/stat values requlary cat /proc/32508/stat | awk '{ print $14 " " $43 }' 55580419 13134692 cat /proc/32508/stat | awk '{ print $14 " " $43 }' 55580419 13134717 cat /proc/32508/stat | awk '{ print $14 " " $43 }' 55580419 13134726 cat /proc/32508/stat | awk '{ print $14 " " $43 }' 55580419 13134738 Actual results: As you can see field 14 does not get any updates although field 43 increases. Expected results: Field 14 (utime) should be increased too