Messages in this thread | | | Date | Wed, 17 Apr 2002 10:22:21 +0900 (JST) | From | Tom Holroyd <> | Subject | Re: Linux 2.4.19-pre5 |
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On Tue, 16 Apr 2002, Andrea Arcangeli wrote:
> there are no mm diffs between pre1 and pre2. The first mm changes are in > pre5.
I was referring to the changes in mm/, such as mm/filemap.c, mm/mmap.c, mm/page_alloc.c, etc., all of which were rather extensive in -pre2, and contained some 64 bit specific stuff.
As I mentioned to Marcelo earlier, I have been able to get ~5 sec mouse freezes on my Alpha. Right now I'm running -pre7, and I just reproduced it. The only way I know of to do it is run a certain graphics program that's work-related, plot something, switch screens (in the 'I have a 4x4 virtual desktop' sense), run a big filter job that reads about 200-300 meg in, filters it, and writes it back out (alternatively, I can scroll through a directory full of images, so maybe it only has to have a few hundred meg read in), then switch back to the graphics screen and hit "refresh". It does not work every time, but I certainly notice it when it happens. Note that after I've done it once, it's much harder to reproduce. Of course, that maybe depends on the phase of the moon, because I reproduced it twice in a row this morning, with profiling data the second time. Here's the list of routines that got ticks (as reported by readprofile) during the ~3 sec freeze I just caused:
1 alloc_skb 1 alpha_switch_to 1 cached_lookup 1 collect_sigign_sigcatch 1 copy_page 1 del_timer 1 dentry_open 1 do_no_page 1 do_page_fault 1 do_switch_stack 1 fput 1 generic_file_read 1 generic_file_write 1 get_gendisk 1 iput 1 link_path_walk 1 locks_remove_flock 1 poll_freewait 1 read_aux 1 remove_wait_queue 1 restore_all 1 schedule 1 scsi_dispatch_cmd 1 session_of_pgrp 1 sock_alloc_send_pskb 1 sys_close 1 sys_ioctl 1 sys_select 1 undo_switch_stack 1 unix_poll 1 unix_stream_sendmsg 1 vsprintf 2 clear_page 2 generic_file_readahead 2 number 2 sock_poll 2 tcp_poll 2 update_atime 3 __free_pages 3 add_wait_queue 3 kfree 3 vsnprintf 4 entSys 4 fget 5 do_select 5 handle_IRQ_event 7 __copy_user 7 sys_read 8 __divqu 10 __remqu 10 do_generic_file_read 18 entInt 19 keyboard_interrupt
I've done this quite a few times now, and add_wait_queue & __free_pages are always there. (Well, and keyboard_interrupt, but that's not it.) Other things are more random, but it's hard to judge precisely (I'm not sure how the profiling works but I assume short routines can be easily missed).
This is an AlphaPC 264DP 666 MHz (uniprocessor version, non-SMP kernel). 1GB RAM. AHA-2940U/UW SCSI on the PCI bus along with a Permedia 2 graphics card.
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