similar to: [PATCH RFC] Btrfs: improve multi-thread buffer read

While testing with my buffer read fio jobs[1], I find that btrfs does not perform well enough. Here is a scenario in fio jobs: We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file, and all of them will race on add_to_page_cache_lru(), and if one thread successfully puts its page into the page cache, it takes the responsibility to read the page''s data. And

Suppose I have "Orange1" data like this. TIME1 RESPONSE RESPSTAT RESPUT REFID ARM SUBARM 0 299.5 Mean 8-item scale 68 0 0 0 287 Median 8-item scale 68 0 0 0 303.9 Mean 8-item scale 68 1 0 0 286 Median 8-item scale 68 1 0 0 295 Mean 8-item scale 85 0 0 12 254 Mean 8-item scale 85 0 0 0 287 Mean 8-item scale 85 1 0 12 216 Mean

Hi, seem to keep running into a wall here. I can''t find any resources on site navigation that can deal with any model being in the nav, allow nesting, and can dynamically update. So I thought about it for a while, and decided on a MenuItems class, which contained the position of the child in relation to it''s siblings, where the parent and the child were polymorphic. Then a given

I have a wizard which consists of two pages. To keep it simple let''s say that the first page asks the user to select a state from the drop down menu. In case the user doesn''t select any state, an error message needs to be displayed. Ideally I would like to do something like this. def new selected_value = params[:addevent][:state_id] if selected_value == "-1"

A user has encountered a NULL pointer kernel oops in btrfs when encountering media errors. The problem has been identified as an unhandled NULL pointer returned from find_get_page(). This modification simply checks for a NULL page, and returns with an error if found (the extent_range_uptodate() function returns 1 on errors). After testing this patch, the user reported that the error with the

On 07/31/2017 02:55 PM, Michal Hocko wrote: > On Mon 31-07-17 12:13:33, Wei Wang wrote: >> Ballooned pages will be marked as MADV_DONTNEED by the hypervisor and >> shouldn't be given to the host ksmd to scan. > Could you point me where this MADV_DONTNEED is done, please? Sure. It's done in the hypervisor when the balloon pages are received. Please see line 40 at

On 07/31/2017 02:55 PM, Michal Hocko wrote: > On Mon 31-07-17 12:13:33, Wei Wang wrote: >> Ballooned pages will be marked as MADV_DONTNEED by the hypervisor and >> shouldn't be given to the host ksmd to scan. > Could you point me where this MADV_DONTNEED is done, please? Sure. It's done in the hypervisor when the balloon pages are received. Please see line 40 at

Hello syslinux, I am trying to add a page break in the license file. Could you help me to add a page break in the text file? I tried "^L" in every 25 lines but it didn't work. What I want to do is this. In the boot prompt, I want to display the license file by pressing F2 but the file is about 300 lines so it just scrolls up very quickly. Do you have any idea how to pause in each

Hi everybody! I recently tried out Wine, and decided to write an article about it. Well, that means I need to get some interesting windows apps working, so far it's only Notepad and Solitaire (won't make anyone cheer). The problem is, when I try to start any installer.exe file, I get some rows of nonsense ("fixme pthread...blabla") and then it exits with the message that it

Hi, sorry to bother you guys with a simple sytnax question; i have a loop of objects taking place (ie, for page in @pages....xxxxxxx....end) and a link associated to each pages so that in the end it looks like this: page1 (link) page2 (link) page3 (link) . . . page n (link) (all of this done by putting a simple ''link to'' in the for loop.) now i need to seperate two pages

Use access_extent_buffer_page() to point at btree location of inline compressed data so it can be inflated without a memcopy. Signed-off-by: jim owens <jowens@hp.com> Signed-off-by: jim owens <jim6336@gmail.com> --- V2 fixes whitespace checkpatch warning fs/btrfs/extent_io.c | 16 ++++++++++++++++ fs/btrfs/extent_io.h | 3 +++ 2 files changed, 19 insertions(+), 0 deletions(-)

In clear_extent_bit, it is enough that next node is adjacent in tree level. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> --- fs/btrfs/extent_io.c | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index fcf77e1..e941cc4 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -577,8 +577,7 @@ hit_next: if

Hello, I''ve been trying for hours to parse an XML using Hpricot. Usually it''s not a problem. Here''s my simple code: #This works and outputs the proper xml data @url1 = ''http://www.sportingnews.com/stories/sportingnews/MLB/rss.xml'' @page1 = Hpricot(open(@url1)) <%= @page 1 %> #This does not work, and I''m scratching my head @url1 =

Hi, The following series of patches implements in btrfs an ioctl to do out-of-band deduplication of file extents. To be clear, this means that the file system is mounted and running, but the dedupe is not done during file writes, but after the fact when some userspace software initiates a dedupe. The primary patch is loosely based off of one sent by Josef Bacik back in January, 2011.

All, This is really starting to get me as i can''t figure out why I am getting this error. Here is what is going on. I have a table called items and a item controller. When I add a new item to the items table I am also creating several associated tables. the code for this so that you can follow along is: def create @item = Item.new(params[:item]) # The item belongs to

hi, I am reading Modern Applied Statistics with S 4th ed$B!#(B page4 have these two lines: > library(MASS) > data(chem) # needed in R only but I find withou the line " data(chem)" I can still access chem, isn't it? is it unnecessary or something i missed here? thanks for the replay in advance.

bio_add_page() requires non-NULL bio ptr for dereferencing. Signed-off-by: Peter Teoh <htmldeveloper@gmail.com> --- extent_io.c.orig1 2008-03-16 12:43:59.000000000 +0800 +++ extent_io.c 2008-03-16 12:45:03.000000000 +0800 @@ -1729,6 +1729,7 @@ static int submit_extent_page(int rw, st if (bio_ret && *bio_ret) { bio = *bio_ret; + BUG_ON(!bio);

Hi gang, Here''s some trivial cleanups that I''ve built up while reading through the code. They''ve been run through xfstests -g quick. - z -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

So both Liu and I made huge messes of find_lock_delalloc_range trying to fix stuff, me first by fixing extent size, then him by fixing something I broke and then me again telling him to fix it a different way. So this is obviously a candidate for some testing. This patch adds a pseudo fs so we can allocate fake inodes for tests that need an inode or pages. Then it addes a bunch of tests to make

hi, i have the following function which is not working for me: function uploadimg (theform,ajaxAction,ajaxTarget){ var imgDesc = theform.getInputs(''page1'', ''text'',''imgDesc''); alert(imgDesc[0]); defaultAction=theform.action; defaultTarget=theform.target; theform.action=ajaxAction; theform.target=ajaxTarget; theform.submit();