BH_Req question

rs marked BH_Req, so try_to_free_buffers() bails out thinking that the buffer is busy ... -- ------ Rajagopal Ananthanarayanan ("ananth") Member Technical Staff, SGI. -

Re: BH_Req question

ould qualify for BUFFER_BUSY_BITS ... so may be it is a buffer_locking problem somewhere. cheers, ananth. ------ Rajagopal Ananthanarayanan ("ananth") Member Technical Staff, SGI.

sync on pages containing EOF

fers) will start the I/O on the EOF-page. So, it appears that filemap_fdatawait will be delayed. I'm just wondering if this argument is correct ... -- -- Rajagopal Ananthanarayanan ("ananth") Me

Clustered IO (was: Re: [patch][rfc][rft] vm throughput 2.4.2-ac4)

rformance by about 15-20%, and we're seeing close to raw I/O performance. With clustering the IO requests are pegged at 1024 sectors (512K bytes) when performing large sequential writes ... ananth. ------ Rajagopal Anant

[PATCH] bug in scsi debug code

ain. -- -- Rajagopal Ananthanarayanan ("ananth") Member Technical Staff, SGI. -- --- ../../linux-2.4.2/linux/drivers/scsi/scsi_merge.c Fri Fe

Re: [PATCH] 2.4.1 find_page_nolock fixes

Rik van Riel wrote: > > 3. add a __find_page_simple(), which is like __find_page_nolock() >but only needs 2 arguments and doesn't touch the page ... this >can be used by IO clustering and other things that really don't >want to influence page aging, removing the 3rd argument also >

Re: [patch][rfc][rft] vm throughput 2.4.2-ac4

d it out to the list. ananth. ------ Rajagopal Ananthanarayanan ("ananth") Member Technical Staff, SGI. -- - To unsubscribe from this list: send the line &q

IO Clustering & Delayed allocation

out contiguous on-disk) as well. Comments, suggestions welcome. ananth. -- -- Rajagopal Ananthanarayanan ("ananth") Member Technical

ramfs & a_ops->truncatepage()

ramfs is concerned, such a change would be a no-op since ramfs doesn't have page->buffers. Is this correct? thanks, ananth. ------ Rajagopal Ananthanarayanan (&qu

Re: test10-pre4: deadlock in VM?

n each of the cpus. Use "cpu x" x=0,1,2,3 on your 4 cpu system to switch to cpu x, and just type "bt" on each cpu. Also, it will be good to see what kswapd (pid 2) is upto ... -----

Re: [PATCH] Re: kernel BUG at buffer.c:827 in test12-pre6 and 7

freeing a page, which may involve taking the page out of a inode mapping, etc. IOW, what page_launder does. bdflush primarily does (a). If we want to move to page-oriented flushing, we atleast need extra information in the _page_ structure as to whether it is time to flush the p

kmap_high/flush_tlb_all/smp_call_function problem

x41d88200, 0x38000, 0x38000, 0x41d88200) kernel .text 0xc010 0xc0135514 0xc01355c0 0xc010a77b system_call+0x33 kernel .text 0xc010 0xc010a748 0xc010a780 -- -- Rajagopal Ananthanara

Re: kernel lock contention and scalability

t be a better choice > > for PG. > > URL? > > Jeff Here it is: http://oss.sgi.com/projects/postwait/ Check out the download section for a 2.4.0 patch. cheers, ananth. -- Rajago

Re: [Kiobuf-io-devel] Re: 1st glance at kiobuf overhead in kernelaio vs pread vs user aio

particular case is solved in the KAIO patch ... Also, can you also put out a library that goes with the kernel patch? I can imagine what it would look like, but ... Cheers, ananth. -- Rajagopal Ananthanarayanan ("ananth") Member Technical St

Re: [Kiobuf-io-devel] Re: 1st glance at kiobuf overhead in kernelaiovs pread vs user aio

Ingo Molnar wrote: > > On Fri, 2 Feb 2001, Rajagopal Ananthanarayanan wrote: > > > Do you really have worker threads? In my reading of the patch it seems > > that the wtd is serviced by keventd. [...] > > i think worker threads (or any 'helper' threads