[lkml]   [2008]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: quicklists confuse meminfo
Ingo Molnar <> writes:

> * Thomas Gleixner <> wrote:
> > Right, also the quicklist_trim() in idle() is freeing at max 16 pages
> > in one go. According to the quicklist_trim() code we keep up to
> > (node_free_pages / 16) in the quicklist unconditionally, which seems
> > rather odd as well.
> i suspect the right approach would be to get rid of them altogether and
> to convert the code to RCU and plain old alloc/free instead.

Are you sure RCU is even needed? AFAIK all delayed freeing
on page table level is already handled by the standard free-after-flush
mmu code.

iirc quicklists were just to avoid rezeroing pages which are known to
be zero at free time (in theory __GFP_ZERO should handle that at
page_alloc.c level, but it doesn't) and to get a little private fast path
for the page allocator (might actually predate the current page_alloc
fast paths)


 \ /
  Last update: 2008-03-09 13:53    [W:0.081 / U:30.716 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site