cgroup memory subsystem pre-allocates quite some memory at boot up.
Example dmesg:
allocated 469762048 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory cgroups
Due to maxcpu=1 it is by far not that much than in a productive kernel.
It still seem to be around 4M statically as no Numa overhead exists with
only one active CPU. It is still worth to disable cgroup memory
pre-allocating in crash kernel environment.
Signed-off-by: Thomas Renninger <trenn at suse.de>
Signed-off-by: Thomas Renninger <Thomas Renninger" trenn at suse.de>
---
kexec/arch/i386/crashdump-x86.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/kexec/arch/i386/crashdump-x86.c b/kexec/arch/i386/crashdump-x86.c
index 7fd1c5b..e6d60a9 100644
--- a/kexec/arch/i386/crashdump-x86.c
+++ b/kexec/arch/i386/crashdump-x86.c
@@ -757,6 +757,23 @@ static int cmdline_add_elfcorehdr(char *cmdline, unsigned long addr)
return 0;
}
+static void cmdline_disable_cgroup(char *cmdline)
+{
+ int cmdlen;
+ char str[30] = " cgroup_disable=memory";
+
+ cmdlen = strlen(cmdline) + strlen(str);
+ if (cmdlen > (COMMAND_LINE_SIZE - 1)) {
+ /* Not fatal if cgroup memory is not disabled */
+ dbgprintf(
+ "Command line overflow, cgroup memory not disabled\n");
+ return;
+ }
+ strcat(cmdline, str);
+
+ dbgprintf("Command line after adding adding cgroup_disable=memory\n");
+ dbgprintf("%s\n", cmdline);
+}
/*
* This routine is specific to i386 architecture to maintain the
@@ -1037,6 +1054,11 @@ int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline,
end = mem_range[i].end;
cmdline_add_memmap_acpi(mod_cmdline, start, end);
}
+ /*
+ * Always add disabling cgroup_diable=memory param at the end,
+ * it's not critical if it falls off
+ */
+ cmdline_disable_cgroup(mod_cmdline);
return 0;
}
--
1.7.6.1
