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mm: convert i_mmap_mutex to rwsem

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The i_mmap_mutex is a close cousin of the anon vma lock, both protecting
similar data, one for file backed pages and the other for anon memory.  To
this end, this lock can also be a rwsem.  In addition, there are some
important opportunities to share the lock when there are no tree
modifications.

This conversion is straightforward.  For now, all users take the write
lock.

[[email protected]: update fremap.c]
Signed-off-by: Davidlohr Bueso <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Acked-by: "Kirill A. Shutemov" <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:54:24 -08:00 • committed by Linus Torvalds
commit c8c06efa8b
10 changed files with 30 additions and 29 deletions
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10
mm/filemap.c
View file

@ -62,16 +62,16 @@
/*
* Lock ordering:
*
* ->i_mmap_mutex (truncate_pagecache)
* ->i_mmap_rwsem (truncate_pagecache)
* ->private_lock (__free_pte->__set_page_dirty_buffers)
* ->swap_lock (exclusive_swap_page, others)
* ->mapping->tree_lock
*
* ->i_mutex
* ->i_mmap_mutex (truncate->unmap_mapping_range)
* ->i_mmap_rwsem (truncate->unmap_mapping_range)
*
* ->mmap_sem
* ->i_mmap_mutex
* ->i_mmap_rwsem
* ->page_table_lock or pte_lock (various, mainly in memory.c)
* ->mapping->tree_lock (arch-dependent flush_dcache_mmap_lock)
*
@ -85,7 +85,7 @@
* sb_lock (fs/fs-writeback.c)
* ->mapping->tree_lock (__sync_single_inode)
*
* ->i_mmap_mutex
* ->i_mmap_rwsem
* ->anon_vma.lock (vma_adjust)
*
* ->anon_vma.lock
@ -105,7 +105,7 @@
* ->inode->i_lock (zap_pte_range->set_page_dirty)
* ->private_lock (zap_pte_range->__set_page_dirty_buffers)
*
* ->i_mmap_mutex
* ->i_mmap_rwsem
* ->tasklist_lock (memory_failure, collect_procs_ao)
*/