Re: Purging the Page Table (was: Purging the Buffer Cache)
--- Juri Haberland <[EMAIL PROTECTED]> wrote: > Al Peat wrote: > > > > Is there any way to completely purge the buffer > > cache -- not just the write requests (ala 'sync' > or > > 'update'), but the whole thing? Can I just call > > invalidate_buffers() or destroy_buffers()? > > What about the ioctl BLKFLSBUF ? > If you are running a SuSE distrib there is already a > tool called flushb > that does what you want. If not, you can download > the simple tool from > http://innominate.org/~juri/flushb.tar.gz Another question: what if I need to purge the page table of all files as well? Is there a clean way to do that? I've been looking at /mm/memory.c, but it doesn't look like clear_page_tables, etc. get exported. I need /all/ read requests to go to disk, and it'd be nice if I could do that without a reboot (but I'll take the reboot if that's the only way to go about it :) Thanks again, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Re: Purging the Page Table (was: Purging the Buffer Cache)
--- Juri Haberland [EMAIL PROTECTED] wrote: Al Peat wrote: Is there any way to completely purge the buffer cache -- not just the write requests (ala 'sync' or 'update'), but the whole thing? Can I just call invalidate_buffers() or destroy_buffers()? What about the ioctl BLKFLSBUF ? If you are running a SuSE distrib there is already a tool called flushb that does what you want. If not, you can download the simple tool from http://innominate.org/~juri/flushb.tar.gz Another question: what if I need to purge the page table of all files as well? Is there a clean way to do that? I've been looking at /mm/memory.c, but it doesn't look like clear_page_tables, etc. get exported. I need /all/ read requests to go to disk, and it'd be nice if I could do that without a reboot (but I'll take the reboot if that's the only way to go about it :) Thanks again, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Purging the Buffer Cache
Is there any way to completely purge the buffer cache -- not just the write requests (ala 'sync' or 'update'), but the whole thing? Can I just call invalidate_buffers() or destroy_buffers()? I know, why in the world would a person do such a thing? Research. It'd be easier for me to write a little program or add it to a module than wait for a reboot each time I need a clean buffer cache. Thanks in advance, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Purging the Buffer Cache
Is there any way to completely purge the buffer cache -- not just the write requests (ala 'sync' or 'update'), but the whole thing? Can I just call invalidate_buffers() or destroy_buffers()? I know, why in the world would a person do such a thing? Research. It'd be easier for me to write a little program or add it to a module than wait for a reboot each time I need a clean buffer cache. Thanks in advance, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
e2fs block to physical block translation
Quick question about blocks: If I assume my hard drive uses 512 blocks, and my ext2 filesystem uses 4k blocks, can I assume the following formula for translation? physical block # / 8 = e2fs block # Thanks, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
e2fs block to physical block translation
Quick question about blocks: If I assume my hard drive uses 512 blocks, and my ext2 filesystem uses 4k blocks, can I assume the following formula for translation? physical block # / 8 = e2fs block # Thanks, Al __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
put/get_module_symbol vs. inter_module_register/put/get/etc.
I've followed the thread on "Persistent module storage" but haven't come across a general explanation of the changes to the inter-module symbol stuff between 2.4test10 and test11. Anyone care to comment on the differences or on whether this is going to be a stable API for 2.4 (it won't be changed again)? __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
put/get_module_symbol vs. inter_module_register/put/get/etc.
I've followed the thread on "Persistent module storage" but haven't come across a general explanation of the changes to the inter-module symbol stuff between 2.4test10 and test11. Anyone care to comment on the differences or on whether this is going to be a stable API for 2.4 (it won't be changed again)? __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
hard_sector / hard_nr_sectors
I was wondering if someone could give me a quick overview of the differences between sector/nr_sectors and hard_sector/hard_nr_sectors in blk_dev.h's request structure, or point me to some documentation/discussion on this? Thanks in advance, Al __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
hard_sector / hard_nr_sectors
I was wondering if someone could give me a quick overview of the differences between sector/nr_sectors and hard_sector/hard_nr_sectors in blk_dev.h's request structure, or point me to some documentation/discussion on this? Thanks in advance, Al __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
No Subject
I was wondering if someone could give me a quick overview of the differences between sector/nr_sectors and hard_sector/hard_nr_sectors in blk_dev.h's request structure, or point me to some documentation/discussion on this? Thanks in advance, Al Peat __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
No Subject
I was wondering if someone could give me a quick overview of the differences between sector/nr_sectors and hard_sector/hard_nr_sectors in blk_dev.h's request structure, or point me to some documentation/discussion on this? Thanks in advance, Al Peat __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
module reentrancy
I could use a little advice on reentrancy issues for modules. I have written a device driver that is nothing more than a circular FIFO buffer in memory. The read and write methods access user space, so I know that those sections of code need to be reentrant. Since the module represents one shared buffer, I use a couple of global variables to keep track of the begin and end of the buffer. I understand that the filp->private field provides some protection for reentrancy, but don't know if that is appropriate in this case. Would a rwlock be a good solution? The buffer is going to be used to collect some information from a modified IDE subsystem, so it will be written to many times in short periods of time, and thus needs to have efficient write methods. I've read all I could find on reentrancy in the kernel docs and in Alessandro Rubini's excellent book. Any other pointers to things I could read (or good examples of reentrant modules) would be appreciated. Thanks, Al __ Do You Yahoo!? Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free! http://photos.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
module reentrancy
I could use a little advice on reentrancy issues for modules. I have written a device driver that is nothing more than a circular FIFO buffer in memory. The read and write methods access user space, so I know that those sections of code need to be reentrant. Since the module represents one shared buffer, I use a couple of global variables to keep track of the begin and end of the buffer. I understand that the filp-private field provides some protection for reentrancy, but don't know if that is appropriate in this case. Would a rwlock be a good solution? The buffer is going to be used to collect some information from a modified IDE subsystem, so it will be written to many times in short periods of time, and thus needs to have efficient write methods. I've read all I could find on reentrancy in the kernel docs and in Alessandro Rubini's excellent book. Any other pointers to things I could read (or good examples of reentrant modules) would be appreciated. Thanks, Al __ Do You Yahoo!? Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free! http://photos.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
