9.98 meminfo ¶

struct meminfo {
    uint64_t phys_total;
    uint64_t phys_avail;
    uint64_t phys_free;
    uint64_t shared_usage;
    uint64_t kernel_usage;
    uint64_t table_usage;
    uint64_t poison_usage;
} __attribute__((packed));

int meminfo(struct meminfo *addr);

This syscall writes memory usage information to the passed structure.

The values stand for:

• phys_total: Total physical memory present in the system.
• phys_avail: Total physical memory available for OS use in the system.
• phys_free: Of the available physical memory, how much is not used.
• shared_usage: Memory used in shared memory segments.
• kernel_usage: Memory used by the kernel.
• table_usage: Memory used in the effort of keeping track of memory.
• poison_usage: Physical memory denied by memory poisoning, and other error-correcting and mitigating measures.

The syscall returns 0 on success or -1 on failure, with the following errno:

• EFAULT: The struct pointed to by addr is not accessible.