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  • Robin Holt's avatar
    [PATCH] Add tmpfs options for memory placement policies · 7339ff83
    Robin Holt authored
    
    
    Anything that writes into a tmpfs filesystem is liable to disproportionately
    decrease the available memory on a particular node.  Since there's no telling
    what sort of application (e.g.  dd/cp/cat) might be dropping large files
    there, this lets the admin choose the appropriate default behavior for their
    site's situation.
    
    Introduce a tmpfs mount option which allows specifying a memory policy and
    a second option to specify the nodelist for that policy.  With the default
    policy, tmpfs will behave as it does today.  This patch adds support for
    preferred, bind, and interleave policies.
    
    The default policy will cause pages to be added to tmpfs files on the node
    which is doing the writing.  Some jobs expect a single process to create
    and manage the tmpfs files.  This results in a node which has a
    significantly reduced number of free pages.
    
    With this patch, the administrator can specify the policy and nodes for
    that policy where they would prefer allocations.
    
    This patch was originally written by Brent Casavant and Hugh Dickins.  I
    added support for the bind and preferred policies and the mpol_nodelist
    mount option.
    
    Signed-off-by: default avatarBrent Casavant <bcasavan@sgi.com>
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarRobin Holt <holt@sgi.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    7339ff83