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| | meminfo - provide information
about memory |
SYNOPSIS
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#include <sys/types.h>
#include <sys/mman.h>
int meminfo(const uint64_t inaddr[], int addr_count, const uint_t info_req[], int info_count, uint64_t outdata[], uint_t validity[]); |
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inaddr
- array of input addresses; the maximum number of addresses that can be processed for each call is MAX_MEMINFO_CNT
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addr_count
- number of addresses
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info_req
- array of types of information requested
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info_count
- number of pieces of information requested for each address in inaddr
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outdata
- array into which results are placed; array size must be the product of info_req and addr_count
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validity
- array of size addr_count containing bitwise result codes; 0th bit evaluates validity of corresponding input address, 1st bit validity of response to first member of info_req, and so
on
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The meminfo() function provides information about virtual and physical memory particular to the calling process. The user or developer of performance utilities can use this information to analyze system memory allocations and develop a better understanding of the factors affecting
application performance.
The caller of meminfo() can obtain the following types of information about both virtual and physical memory.
-
MEMINFO_VPHYSICAL
- physical address corresponding to virtual address
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MEMINFO_VLGRP
- latency group of physical page corresponding to virtual address
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MEMINFO_VPAGESIZE
- size of physical page corresponding to virtual address
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MEMINFO_VREPLCNT
- number of replicated physical pages corresponding to specified virtual address
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MEMINFO_VREPL | n
-
nth physical replica of specified virtual address
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MEMINFO_VREPL_LGRP | n
- lgrp of nth physical replica of specified virtual address
-
MEMINFO_PLGRP
- latency group of specified physical address
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Upon successful completion meminfo() returns 0. Otherwise -1 is returned and errno is set to indicate the error.
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The meminfo() function will fail if:
-
EFAULT
- The area pointed to by outdata or validity could not be written, or the data pointed to by info_req or inaddr could not be read.
-
EINVAL
- The value of info_count is greater than 31 or less than 1, or the value of addr_count is less than 1.
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| | Example 1. Print physical pages and page sizes corresponding to a set of virtual addresses.
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The following example prints the physical pages and page sizes corresponding to a set of virtual addresses.
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void
print_info(void **addrvec, int how_many)
{
static const uint_t info[] = {
MEMINFO_VPHYSICAL,
MEMINFO_VPAGESIZE
};
int info_num = sizeof (info) / sizeof (info[0]);
int i;
uint64_t *inaddr = alloca(sizeof (uint64_t) * how_many);
uint64_t *outdata = alloca(sizeof (uint64_t) * how_many * info_num);
uint_t *validity = alloca(sizeof (uint_t) * how_many);
for (i = 0; i < how_many; i++)
inaddr[i] = (uint64_t)addrvec[i];
if (meminfo(inaddr, how_many, info, info_num, outdata, validity) < 0) {
perror("meminfo");
return;
}
for (i = 0; i < how_many; i++) {
if ((validity[i] & 1) == 0)
printf("address 0x%llx not part of address space\n",
inaddr[i]);
else if ((validity[i] & 2) == 0)
printf("address 0x%llx has no physical page "
"associated with it\n", inaddr[i]);
else {
char buff[80];
if ((validity[i] & 4) == 0)
strcpy(buff, "<Unknown>");
else
sprintf(buff, "%lld",
outdata[i * info_num + 1]);
printf("address 0x%llx is backed by physical "
"page 0x%llx of size %s\n",
inaddr[i], outdata[i * info_num], buff);
}
}
}
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See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Stable |
| MT-Level | Async-Signal-Safe |
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