On Fri, Feb 14, 2020 at 4:06 AM Kamil Paral <kparal@xxxxxxxxxx> wrote:
>
> On Thu, Feb 13, 2020 at 11:16 PM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote:
>
>> Reproduce steps for hibernation failing. I don't know if it's as easy
>> as "Launch Firefox, and load 34 pages of bbc.com, then try to
>> hibernate with 'systemctl hibernate'" - and voila, not enough memory
>> error.
>
>
> Yes, in my experience it is that easy. If I look into htop before hibernating and I'm over 50% usage (not counting buffers/cache
I'm not familiar with htop. If I run it without options, I see on the
top left my CPUs followed by "Mem" which seems to be the same thing as
/proc/meminfo's "Active(file):" value (if I divide by 1MiB). Is your
50% usage based on this "Mem" reporting?
There isn't a corresponding value in top, the "Mem ... Used" value is
totally different there.
> Feb 14 12:03:28 titan kernel: PM: hibernation exit
> Feb 14 12:03:28 titan systemd-sleep[3424]: Failed to suspend system. System resumed again: Cannot allocate memory
This is a systemd error, without a corresponding kernel message. So is
it really a kernel complaint or problem? Looking at systemd
./src/sleep/sleep.c
220 r = write_state(&f, states);
221 if (r < 0)
222 log_struct_errno(LOG_ERR, r,
223 "MESSAGE_ID="
SD_MESSAGE_SLEEP_STOP_STR,
224 LOG_MESSAGE("Failed to
suspend system. System resumed again: %m"),
225 "SLEEP=%s", arg_verb);
I don't see where "Cannot allocate memory" comes from in systemd, but
in the kernel:
./Documentation/admin-guide/sysctl/vm.rst:864:"fork: Cannot allocate
memory". which is in
https://www.kernel.org/doc/html/v5.5/admin-guide/sysctl/vm.html under
user_reserve_kbytes
Default value on Fedora is
$ cat /proc/sys/vm/user_reserve_kbytes
131072
$ cat /proc/sys/vm/overcommit_memory
0
Hmm. Anyway, I'm not sure what's running out of memory or why. Right
before this, hibernation exit comes from
./power/hibernate.c:781: pr_info("hibernation exit\n");
Looks like it got to here:
732 error = hibernation_snapshot(hibernation_mode ==
HIBERNATION_PLATFORM);
733 if (error || freezer_test_done)
734 goto Free_bitmaps;
*shrug*
It definitely didn't get to writing out the hibernation image.
--
Chris Murphy
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