Bug#364119: kwin writes to disk synchronously
Package: kwin
Severity: normal
Hi there,
I got a report from a laptop-mode-tools user saying that kwin kept his
disk spun up. I checked his logs, and indeed it seems to be the case
that his kwin process explicitly syncs pretty regularly. I straced my
own kwin to confirm this behaviour, and I see the following:
open("/home/bsamwel/.kde/share/config/kwinrulesrc6EREMa.new",
O_RDWR|O_CREAT|O_EXCL, 0600) = 11
umask(0) = 022
umask(022) = 0
fchmod(11, 0600) = 0
getgid32() = 1000
getuid32() = 1000
fchown32(11, 1000, 1000) = 0
fcntl64(11, F_SETFD, FD_CLOEXEC) = 0
stat64("/home/bsamwel/.kde/share/config/kwinrulesrc",
{st_mode=S_IFREG|0600, st_size=824, ...}) = 0
getuid32() = 1000
getgid32() = 1000
fchmod(11, 0100600) = 0
fchmod(11, 0600) = 0
fcntl64(11, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(11, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb6705000
_llseek(11, 0, [0], SEEK_CUR) = 0
write(11, "[1]\ndescription=(Default) Disabl"..., 824) = 824
fdatasync(11) = 0
close(11) = 0
munmap(0xb6705000, 4096) = 0
rename("/home/bsamwel/.kde/share/config/kwinrulesrc6EREMa.new",
"/home/bsamwel/.kde/share/config/kwinrulesrc") = 0
and then:
open("/home/bsamwel/.kde/share/config/kdeglobalsZbum9a.new",
O_RDWR|O_CREAT|O_EXCL, 0600) = 11
umask(0) = 022
umask(022) = 0
fchmod(11, 0600) = 0
getgid32() = 1000
getuid32() = 1000
fchown32(11, 1000, 1000) = 0
fcntl64(11, F_SETFD, FD_CLOEXEC) = 0
stat64("/home/bsamwel/.kde/share/config/kdeglobals",
{st_mode=S_IFREG|0600, st_size=5804, ...}) = 0
getuid32() = 1000
getgid32() = 1000
fchmod(11, 0100600) = 0
fchmod(11, 0600) = 0
fcntl64(11, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(11, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb6705000
_llseek(11, 0, [0], SEEK_CUR) = 0
write(11, "[$Version]\nupdate_info=kded.upd:"..., 4096) = 4096
write(11, "ndow to Desktop 2=none\nWindow to"..., 1708) = 1708
fdatasync(11) = 0
close(11) = 0
munmap(0xb6705000, 4096) = 0
rename("/home/bsamwel/.kde/share/config/kdeglobalsZbum9a.new",
"/home/bsamwel/.kde/share/config/kdeglobals") = 0
So, here's my question: is that call to fdatasync() really necessary?
And can it be disabled somehow? It makes laptop mode pretty much
unusable on KDE. :-(
Cheers,
Bart Samwel
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