kernfs_memcg: Add helpers to gather memcgroup related data #96
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I have added other helpers and modified the earlier ones, so that they work with other UEK versions as well |
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Signed-off-by: Imran Khan <[email protected]>
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Thanks @biger410 for reviewing this. I have addressed your review comments. Could you please have a look and let me know if you have any further feedback |
Add kernfs based helpers to extract memcg related information, like number of active and inactive memcgroups, page cache pages pinning memcgroups etc. Orabug: 37322867 Signed-off-by: Imran Khan <[email protected]>
Orabug: 37322867 Signed-off-by: Imran Khan <[email protected]>
Orabug: 37322867 Signed-off-by: Imran Khan <[email protected]>
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The new changes look good to me. One more request is that can we add a corelen module for it? It should run either with -M option or -A option. |
Add corelens module to dump pages that are pinning memcgroups. By default upto 10K such pages are shown. Orabug: 37322867 Signed-off-by: Imran Khan <[email protected]>
I have added corelens module. python3 -m drgn_tools.corelens ~/Local-vmcores/Workqueue-study/UEK-6-rds-issue/VMCORE -d ~/Local-vmcores/Workqueue-study/UEK-6-rds-issue/ page: 0xffffc35c881b0000 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0040 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0080 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b00c0 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0100 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0140 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0180 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b01c0 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip |
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Is there a paste error? How could this trigger the corelen cmd? And with 10000 default, how could user run corelen cmd to dump all pages? |
Yes, it was a copy paste error and missed the -M part . The actual command is: and output is like the one shown below: `imran@imran-metabox:~/oracle-samples-drgn-tools/drgn-tools$ python3 -m drgn_tools.corelens ~/Local-vmcores/Workqueue-study/UEK-6-rds-issue/VMCORE -d ~/Local-vmcores/Workqueue-study/UEK-6-rds-issue/ -M kernfs_memcg page: 0xffffc35c881b0040 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0080 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b00c0 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0100 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0140 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b0180 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip page: 0xffffc35c881b01c0 cgroup: /user.slice/user-0.slice/session-7128.scope state: CSS_ONLINE|CSS_VISIBLE path: /datastore/oracle_230124_0745EST/diag/asm/cell/scaqat06celadm02/incpkg/pkg_76/seq_1/cell/IPSPKG_20230120060027_COM_1.zip ............................................................ Regarding default page count of 10K, I am using this value to make sure we don't end up spending a lot of time while collecting this data. We have seen that scanning all pages can take hours , so my idea here is that we get information of 10K pages and if that does not indicate anything conclusive , we can later scan all pages. Let me know if its sounds okay or using something other than 10K would be more acceptable |
This as of now is just a dump of some of my bespoke debug scripts.