Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1303199

Re: weird DirectMap2M accounting.

Show all headers | View raw

On Wed, Jan 06, 2016 at 07:11:41PM -0500, Dave Jones wrote:
 > On Wed, Jan 06, 2016 at 06:55:27PM -0500, Dave Jones wrote:
 >  > I just spotted this in /proc/meminfo on an old Core2 machine with 4G.
 >  > 
 >  > DirectMap2M:    18446744073709543424 kB
 >  > 
 >  > Looks like we subtracted 8192 from 0 somewhere.
 >  > 
 >  > Should split_page_count() be checking that direct_pages_count > 0 ?
 > 
 > Ok, this diff makes that number print out as 0.
 > 
 > If this looks ok, I'll submit it properly, though I'd like to better
 > understand what's happening here. Shouldn't I have 2M pages ?

Ah. We disable them when compiling with DEBUG_PAGEALLOC.
So this is only needed in that case.
If people think it's worth an ifdef for those two added lines I'll add it,
but it seems pretty benign to just always check.

thoughts?

	Dave

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

weird DirectMap2M accounting. Dave Jones <davej@codemonkey.org.uk> - 2016-01-07 01:00 +0100
  Re: weird DirectMap2M accounting. Dave Jones <davej@codemonkey.org.uk> - 2016-01-07 01:20 +0100
    Re: weird DirectMap2M accounting. Thomas Gleixner <tglx@linutronix.de> - 2016-01-11 10:00 +0100
  Re: weird DirectMap2M accounting. Dave Jones <davej@codemonkey.org.uk> - 2016-01-07 01:20 +0100

csiph-web