The patch titled
readahead: remove the limit max_sectors_kb imposed on max_readahead_kb
has been added to the -mm tree. Its filename is
readahead-remove-the-limit-max_sectors_kb-imposed-on-max_readahead_kb.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: readahead: remove the limit max_sectors_kb imposed on max_readahead_kb
From: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Remove the size limit max_sectors_kb imposed on max_readahead_kb.
The size restriction is unreasonable. Especially when max_sectors_kb cannot
grow larger than max_hw_sectors_kb, which can be rather small for some disk
drives.
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Acked-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
block/ll_rw_blk.c | 9 ---------
1 file changed, 9 deletions(-)
diff -puN block/ll_rw_blk.c~readahead-remove-the-limit-max_sectors_kb-imposed-on-max_readahead_kb block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~readahead-remove-the-limit-max_sectors_kb-imposed-on-max_readahead_kb
+++ a/block/ll_rw_blk.c
@@ -4054,7 +4054,6 @@ queue_max_sectors_store(struct request_q
max_hw_sectors_kb = q->max_hw_sectors >> 1,
page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
- int ra_kb;
if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
return -EINVAL;
@@ -4063,14 +4062,6 @@ queue_max_sectors_store(struct request_q
* values synchronously:
*/
spin_lock_irq(q->queue_lock);
- /*
- * Trim readahead window as well, if necessary:
- */
- ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_SHIFT - 10);
- if (ra_kb > max_sectors_kb)
- q->backing_dev_info.ra_pages =
- max_sectors_kb >> (PAGE_CACHE_SHIFT - 10);
-
q->max_sectors = max_sectors_kb << 1;
spin_unlock_irq(q->queue_lock);
_
Patches currently in -mm which might be from wfg@xxxxxxxxxxxxxxxx are
readahead-compacting-file_ra_state.patch
readahead-mmap-read-around-simplification.patch
readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos.patch
readahead-combine-file_ra_stateprev_index-prev_offset-into-prev_pos-fix.patch
radixtree-introduce-radix_tree_scan_hole.patch
readahead-basic-support-of-interleaved-reads.patch
readahead-remove-the-local-copy-of-ra-in-do_generic_mapping_read.patch
readahead-remove-several-readahead-macros.patch
readahead-remove-the-limit-max_sectors_kb-imposed-on-max_readahead_kb.patch
filemap-trivial-code-cleanups.patch
filemap-convert-some-unsigned-long-to-pgoff_t.patch
convert-ill-defined-log2-to-ilog2.patch
-
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