write_cache_pages(9) [centos man page]

WRITE_CACHE_PAGES(9)					    Memory Management in Linux					      WRITE_CACHE_PAGES(9)

NAME

       write_cache_pages - walk the list of dirty pages of the given address space and write all of them.

SYNOPSIS

       int write_cache_pages(struct address_space * mapping, struct writeback_control * wbc, writepage_t writepage, void * data);

ARGUMENTS

       mapping
	   address space structure to write

       wbc
	   subtract the number of written pages from *wbc->nr_to_write

       writepage
	   function called for each page

       data
	   data passed to writepage function

DESCRIPTION

       If a page is already under I/O, write_cache_pages skips it, even if it's dirty. This is desirable behaviour for memory-cleaning writeback,
       but it is INCORRECT for data-integrity system calls such as fsync.  fsync and msync need to guarantee that all the data which was dirty at
       the time the call was made get new I/O started against them. If wbc->sync_mode is WB_SYNC_ALL then we were called for data integrity and we
       must wait for existing IO to complete.

       To avoid livelocks (when other process dirties new pages), we first tag pages which should be written back with TOWRITE tag and only then
       start writing them. For data-integrity sync we have to be careful so that we do not miss some pages (e.g., because some other process has
       cleared TOWRITE tag we set). The rule we follow is that TOWRITE tag can be cleared only by the process clearing the DIRTY tag (and
       submitting the page for IO).

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      WRITE_CACHE_PAGES(9)

tapset::nfs(3stap)														tapset::nfs(3stap)

NAME

       tapset::nfs - systemtap nfs tapset

DESCRIPTION

       nfs.fop.llseek
	      NFS client llseek operation

	       See probe::nfs.fop.llseek(3stap)
	       for details.

       nfs.fop.read
	      NFS client read operation

	       See probe::nfs.fop.read(3stap)
	       for details.

       nfs.fop.write
	      NFS client write operation

	       See probe::nfs.fop.write(3stap)
	       for details.

       nfs.fop.aio_read
	      NFS client aio_read file operation

	       See probe::nfs.fop.aio_read(3stap)
	       for details.

       nfs.fop.aio_write
	      NFS client aio_write file operation

	       See probe::nfs.fop.aio_write(3stap)
	       for details.

       nfs.fop.mmap
	      NFS client mmap operation

	       See probe::nfs.fop.mmap(3stap)
	       for details.

       nfs.fop.open
	      NFS client file open operation

	       See probe::nfs.fop.open(3stap)
	       for details.

       nfs.fop.flush
	      NFS client flush file operation

	       See probe::nfs.fop.flush(3stap)
	       for details.

       nfs.fop.release
	      NFS client release page operation

	       See probe::nfs.fop.release(3stap)
	       for details.

       nfs.fop.fsync
	      NFS client fsync operation

	       See probe::nfs.fop.fsync(3stap)
	       for details.

       nfs.fop.lock
	      NFS client file lock operation

	       See probe::nfs.fop.lock(3stap)
	       for details.

       nfs.fop.sendfile
	      NFS client send file operation

	       See probe::nfs.fop.sendfile(3stap)
	       for details.

       nfs.fop.check_flags
	      NFS client checking flag operation

	       See probe::nfs.fop.check_flags(3stap)
	       for details.

       nfs.aop.readpage
	      NFS client synchronously reading a page

	       See probe::nfs.aop.readpage(3stap)
	       for details.

       nfs.aop.readpages
	      NFS client reading multiple pages

	       See probe::nfs.aop.readpages(3stap)
	       for details.

       nfs.aop.set_page_dirty
	      NFS client marking page as dirty

	       See probe::nfs.aop.set_page_dirty(3stap)
	       for details.

       nfs.aop.writepage
	      NFS client writing a mapped page to the NFS server

	       See probe::nfs.aop.writepage(3stap)
	       for details.

       nfs.aop.writepages
	      NFS client writing several dirty pages to the NFS server

	       See probe::nfs.aop.writepages(3stap)
	       for details.

       nfs.aop.write_begin
	      NFS client begin to write data

	       See probe::nfs.aop.write_begin(3stap)
	       for details.

       nfs.aop.write_end
	      NFS client complete writing data

	       See probe::nfs.aop.write_end(3stap)
	       for details.

       nfs.aop.release_page
	      NFS client releasing page

	       See probe::nfs.aop.release_page(3stap)
	       for details.

SEE ALSO

	  probe::nfs.fop.llseek(3stap),      probe::nfs.fop.read(3stap),      probe::nfs.fop.write(3stap),	probe::nfs.fop.aio_read(3stap),
       probe::nfs.fop.aio_write(3stap),      probe::nfs.fop.mmap(3stap),       probe::nfs.fop.open(3stap),	  probe::nfs.fop.flush(3stap),
       probe::nfs.fop.release(3stap),	     probe::nfs.fop.fsync(3stap),      probe::nfs.fop.lock(3stap),	probe::nfs.fop.sendfile(3stap),
       probe::nfs.fop.check_flags(3stap),		 probe::nfs.aop.readpage(3stap),		 probe::nfs.aop.readpages(3stap),
       probe::nfs.aop.set_page_dirty(3stap),		    probe::nfs.aop.writepage(3stap),		  probe::nfs.aop.writepages(3stap),
       probe::nfs.aop.write_begin(3stap),  probe::nfs.aop.write_end(3stap),  probe::nfs.aop.release_page(3stap),  stap(1), stapprobes(3stap)

IBM
									---							tapset::nfs(3stap)