Today (Saturday) We will make some minor tuning adjustments to MySQL.

You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.

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FreeBSD 11.0 - man page for remap_pfn_range (suse section 9)

REMAP_PFN_RANGE(9)					    Memory Management in Linux						REMAP_PFN_RANGE(9)

NAME
remap_pfn_range - remap kernel memory to userspace
SYNOPSIS
int remap_pfn_range(struct vm_area_struct * vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot);
ARGUMENTS
vma user vma to map to addr target user address to start at pfn physical address of kernel memory size size of map area prot page protection flags for this mapping
NOTE
this is only safe if the mm semaphore is held when called.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 REMAP_PFN_RANGE(9)

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