Bug 142994
| Summary: | Per-process shared memory is greater than resident memory | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Lev Makhlis <lev_makhlis> |
| Component: | kernel | Assignee: | Dave Jones <davej> |
| Status: | CLOSED RAWHIDE | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 4.0 | CC: | jbaron, pfrields |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| URL: | http://linux.bkbits.net:8080/linux-2.5/cset@1.2026.12.193 | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-12-15 17:27:02 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
these have been merged already. thanks. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041020 Description of problem: Quoting Hugh Dickins: "The third "shared" field of /proc/$pid/statm in 2.4 was a count of pages in the mm whose page_count is more than 1 (oddly, including pages shared just with swapcache). That's too costly to calculate each time, so 2.6 changed it to the total file-backed extent. But Andrea knows apps and users surprised when (rss - shared) goes negative: we need to provide an rss-like statistic, close to the 2.4 interpretation. Something that's quick and easy to maintain accurately is mm->anon_rss, the count of anonymous pages in the mm. Then shared = rss - anon_rss gives a pretty good and meaningful approximation to 2.4's intention: wli confirms that this will be useful to Oracle too." Version-Release number of selected component (if applicable): 2.6.9-1.675_EL How reproducible: Always Steps to Reproduce: 1. Run "top" Actual Results: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3098 root 17 0 3292 924 1664 R 1.0 0.5 0:01.11 top Expected Results: SHR < RES Additional info: Please consider merging Hugh's patches from 2.6.10-rc2: http://linux.bkbits.net:8080/linux-2.5/cset@1.2026.12.193 http://linux.bkbits.net:8080/linux-2.5/cset@1.2026.12.194