linux - Page migration fails from CMA(contiguous memory allocator) area -

-

i facing problem cma. trying allocate device memory through cma(contiguous memory allocation) arm based target board running linux 3.8 kernel.

while requesting memory allocation through private cma node, results "no memin cma area". eventhough have reserved required memory. while debugging "_alloc_contig_migrate_range" function found migration of pages failed , resulted in no mem in cma area.

while pages satisfying following condition in "migrate_page_move_mapping(migrate.c)" function being migrated.

   if (!mapping) {             /* anonymous page without mapping */              if (page_count(page) != 1) {                          return -eagain;              }              return migratepage_success;    }

other pages fail , returns in migrate_page_move_mapping() 

    if (page_count(page) != expected_count ||                  radix_tree_deref_slot_protected(pslot, &mapping->tree_lock) != page) {                          spin_unlock_irq(&mapping->tree_lock);          return -eagain;      }

whereas page_count(page) -->3 , expected_count-->2 doesnt match , hence returns -eagain repeatedly.

while looking @ page flags found following diffrence in flags.

migration success-> 0xc3a40059

migration fail-> 0xc3a0000d

diff in flags

observation flags--> pg_dirty pg_active pg_swapbacked pg_referenced

migration success----> set set set notset

migration fails------> notset notset notset set

any suggestion helpful.


Comments

Post a Comment

Popular posts from this blog

python - Subclassed QStyledItemDelegate ignores Stylesheet -

-
i'm trying subclass qstyleditemdelegate remove focus rectangle in qcombobox . even though i'm calling base implementation of paint function , nothing else, result different. looks if parts of style-sheet influence bounding box of item taken consideration. class pstyleditemdelegate(qstyleditemdelegate): def __init__(self, *args, **kwds): super(pstyleditemdelegate, self).__init__(*args, **kwds) def paint(self, *args, **kwargs): qstyleditemdelegate.paint(*args, **kwargs) what have paint unmodified qstyleditemdelegate ? as suggested tried replacing pyside pyqt4 , works, appears bug. update pyside 1.1.2 1.2.1 result same. unfortunately switch breaks other parts of code, if there no other suggestions i'm going accept answer. edit bug tracked here
Read more

java - HttpClient 3.1 Connection pooling vs HttpClient 4.3.2 -

-
i have used httpclient3.1(java) connection pooling below : import org.apache.commons.httpclient.httpclient; import org.apache.commons.httpclient.multithreadedhttpconnectionmanager; import org.apache.commons.httpclient.params.httpclientparams; import org.apache.commons.httpclient.params.httpmethodparams; import org.apache.log4j.logger; public class httpclientmanager { private static logger logger = logger.getlogger(httpclientmanager.class); private static multithreadedhttpconnectionmanager connectionmanager = new multithreadedhttpconnectionmanager(); private static httpclientparams clientparams = new httpclientparams(); static { try { clientparams.makelenient(); clientparams.setauthenticationpreemptive(false); clientparams.setparameter(httpmethodparams.so_timeout, new integer(30000)); // set so_timeout clientparams.setparameter(httpmethodparams.head_body_check_timeout, new integer(3000)); // head responses ...
Read more

node.js - StackOverflow API not returning JSON -

-
i using node.js script gather data stackoverflow. know responses gzipped, put code in should take care of that. script follows: var request = require('request'); var zlib = require('zlib'); function getstackoverflowresponse(url, callback){ request(url, {encoding: null}, function(err, response, body){ if(response.headers['content-encoding'] == 'gzip'){ zlib.gunzip(body, function(err, dezipped) { callback(dezipped); }); } else { callback(body); } }); } var url = "https://api.stackexchange.com/docs/questions#pagesize=2&order=desc&min=2014-01-04&max=2014-02-02&sort=activity&tagged=apigee&filter=default&site=stackoverflow&run=true"; getstackoverflowresponse(url, function(questions) { console.log(questions); }); instead of getting json output, i'm getting following response: buffer 0d 0a 0d 0a 0d 0a 0d 0a 3c 21 44 4f 43 54 59 50 45 20 48...
Read more