NAME
Sys::PageCache - handling page cache related on files
INSTALLATION
To install this module, run the following commands:
perl Makefile.PL
make
make test
make install
SYNOPSIS
use Sys::PageCache;
# determine whether pages are resident in memory
$r = fincore "/path/to/file";
printf("cached/total_size=%llu/%llu cached/total_pages=%llu/%llu\n",
$r->{cached_size}, $r->{file_size},
$r->{cached_pages}, $r->{total_pages},
);
# free cached pages on a file
$r = fadvise "/path/to/file", 0, 0, POSIX_FADV_DONTNEED;
DESCRIPTION
Sys::PageCache is for handling page cache related on files.
METHODS
fincore($filepath:Str [, $offset:Int [, $length:Int]])
Determine whether pages are resident in memory. $offset and $length
are optional.
fincore returns a following hash ref.
{
cached_pages => Int, # number of cached pages
cached_size => Int, # size of cached pages
total_pages => Int, # number of pages if cached whole file
file_size => Int, # size of file
page_size => Int, # page size on your system
}
fadvise($filepath:Str, $offset:Int, $length:Int, $advice:Int)
Call posix_fadvise(2).
fadvise returns 1 if success.
page_size()
Returns size of page size on your system.
EXPORTS
fincore
fadvise
POSIX_FADV_NORMAL
POSIX_FADV_SEQUENTIAL
POSIX_FADV_RANDOM
POSIX_FADV_NOREUSE
POSIX_FADV_WILLNEED
POSIX_FADV_DONTNEED
AUTHOR
HIROSE Masaaki <hirose31 _at_ gmail.com>
REPOSITORY
https://github.com/hirose31/Sys-PageCache
git clone git://github.com/hirose31/Sys-PageCache.git
patches and collaborators are welcome.
SEE ALSO
mincore(2), posix_fadvise(2),
https://code.google.com/p/linux-ftools/,
https://github.com/nhayashi/pagecache-tool
LICENSE
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
