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meminfo (2)
  • >> meminfo (2) ( Solaris man: Системные вызовы )
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    NAME

    meminfo - provide information about memory
     
    

    SYNOPSIS

    #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[]);
    

     

    PARAMETERS

    inaddr

    array of input addresses; the maximum number of addresses that can be processed for each call is MAX_MEMINFO_CNT

    addr_count

    number of addresses

    info_req

    array of types of information requested

    info_count

    number of pieces of information requested for each address in inaddr

    outdata

    array into which results are placed; array size must be the product of info_count and addr_count

    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

     

    DESCRIPTION

    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

    MEMINFO_VLGRP

    locality group of physical page corresponding to virtual address

    MEMINFO_VPAGESIZE

    size of physical page corresponding to virtual address

    MEMINFO_VREPLCNT

    number of replicated physical pages corresponding to specified virtual address

    MEMINFO_VREPL | n

    nth physical replica of specified virtual address

    MEMINFO_VREPL_LGRP | n

    lgrp of nth physical replica of specified virtual address

    MEMINFO_PLGRP

    locality group of specified physical address

     

    RETURN VALUES

    Upon successful completion meminfo() returns 0. Otherwise -1 is returned and errno is set to indicate the error.  

    ERRORS

    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.

     

    EXAMPLES

    Example 1 Print physical pages and page sizes corresponding to a set of virtual addresses.

    The following example prints the physical pages and page sizes corresponding to a set of virtual addresses.

    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);
           }
       }    
    }
    

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStable

    MT-Level

     

    SEE ALSO

    memcntl(2), mmap(2), gethomelgroup(3C), getpagesize(3C), madvise(3C), sysconf(3C), attributes(5)


     

    Index

    NAME
    SYNOPSIS
    PARAMETERS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    EXAMPLES
    ATTRIBUTES
    SEE ALSO


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