| Summary: | Suboptimal initialization of accounts-daemon with a large /var/log/wtmp | ||
|---|---|---|---|
| Product: | accountsservice | Reporter: | Jan Ziak (http://atom-symbol.net) <0xe2.0x9a.0x9b> |
| Component: | general | Assignee: | Matthias Clasen <mclasen> |
| Status: | RESOLVED MOVED | QA Contact: | |
| Severity: | major | ||
| Priority: | medium | CC: | 0xe2.0x9a.0x9b, marius.vollmer, rstrode, stefw |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
Dump of the syscall sequence which repeats ~80000 times
Gentoo Linux sys-apps:accountsservice-0.6.43:20170101-181550.log |
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Created attachment 128706 [details]
Dump of the syscall sequence which repeats ~80000 times
$ wc -l /etc/passwd 62 /etc/passwd what version of accountsservice are you testing with? We don't read wtmp since 0.6.43 and there were some other fixes that went in (which I guess you already know about since they're mentioned in the bug you referenced?) (In reply to Ray Strode [halfline] from comment #3) > what version of accountsservice are you testing with? > > We don't read wtmp since 0.6.43 and there were some other fixes that went in > (which I guess you already know about since they're mentioned in the bug you > referenced?) # /usr/libexec/accounts-daemon --version accounts-daemon 0.6.43 # strace -e open /usr/libexec/accounts-daemon |& grep wtmp open("/var/log/wtmp", O_RDONLY|O_CLOEXEC) = 8 # readelf -d /usr/libexec/accounts-daemon Dynamic section at offset 0x20dc8 contains 32 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libpolkit-gobject-1.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgio-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgobject-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libglib-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x000000000000000c (INIT) 0x405d30 .... Created attachment 128730 [details]
Gentoo Linux sys-apps:accountsservice-0.6.43:20170101-181550.log
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Initialization of accounts-daemon is too heavy on the CPU. In the case described below, a wtmp of 87 megabytes results in: - 2.3 million calls to the Linux kernel - File /etc/passwd is open&closed 80000 times ---- # ls -l /var/log/wtmp -rw-rw-r-- 1 root utmp 87M Jan 1 19:18 /var/log/wtmp # perf stat -e raw_syscalls:sys_enter -- /usr/libexec/accounts-daemon ^C Performance counter stats for '/usr/libexec/accounts-daemon': 2,382,413 raw_syscalls:sys_enter # strace -f -e open /usr/libexec/accounts-daemon |& grep etc/passwd | wc -l 81783 ---- Related bugs: #48177