It says
> readahead() blocks until the specified data has been read.
but reading the kernel source code, it simply calls
force_page_cache_readahead (the same called by fadvise/madvise), that
just post a prefetch, and it may block only when the I/O queue is
full.
posix_fadvise (with POSIX_FADV_WILLNEED flag) description says, instead:
POSIX_FADV_WILLNEED initiates a non-blocking read of the
specified region into
the page cache. The amount of data read may be decreased by the kernel
depending on virtual memory load. (A few megabytes will usually be fully
satisfied, and more is rarely useful.)
--
__________________________________________________________________________
dott. Corrado Zoccolo mailto:czoccolo@xxxxxxxxx
PhD - Department of Computer Science - University of Pisa, Italy
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