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occurs, the notification bracelet execution processWhen an event occurs, the time invokes the callback function in each notification block in the NOTIFIER_CALL_CHAIN traversal notification chain, and the callback function determines whether to perform the processing. static int __kprobes notifier_call_chain (struct notifier_block **nl, unsigned long val, void *v, int nr_to_

-CPU poll_list, and whoever CLE Ars that bit * can remove from the list right before clearing the bit. */struct List_head poll_list; Device list (devices that have new frames waiting to be processed in the ingress queue) unsigned long state; int weight; Int (*poll) (struct napi_struct *, int); Exit the buffer from the ingress queue of the device (Napi private queue, Softnet_data->input_pkt_queue different) #ifdef config_netpoll spinlock_t Poll_lock; int poll_owner; #endif unsigne

device's shutdown can be performed explicitly by a user command or implicitly through another program. device shutdown has the following tasks: Send to Netdev_chain Netdev_going_down Notice called Dev_deactivat Closing a queue rule Clear Dev->state's _ _link_state_start flag to indicate that the device is disabled If you are performing a polling operation that reads the Ingress queue packet, wait for the operation to complete. Because of the dev->state relationship, the ingress queue

instance, identified by the variable Fn_key, and its value represents that subnet. For example, for a subnet 10.1.1.0/24,fn_key of 10.1.1. The destination subnet shares the same fib_node with different routes (that is, the same fn_key). Each route has its own fib_alias structure. Each Fib_alias instance is associated with a fib_info structure that holds the actual routing information (that is, how to reach the destination).Second, the routing table initialization The following two rout

when returning an external row. You should select only the outer row to take a value of NULL, and a column with a value that is not NULL in the other rows. There are three scenarios in which you can consider safe use: primary key columns, join columns, and columns defined as NOT NULL . The column value of the primary key cannot be null, so if NULL appears on such a column, it means that the behavior is an outer row. If a row's join is listed as a null value, the row is filtered out in the secon

struct Net_protocol Icmp_protocol = { . Handler = Icmp_rcv, . No_policy = 1, . NETNS_OK = 1,};After initialization of the protocol structure, in Inet_init, the various protocols are added to the kernel. static int __init inet_init (void) {struct Sk_buff *dummy_skb; struct INET_PROTOSW *q; struct List_head *r; int rc =-einval; build_bug_on (sizeof (struct inet_skb_parm) > sizeof (DUMMY_SKB-GT;CB)); rc = Proto_register (tcp_prot, 1); if (RC) goto out; rc = Proto

optimizations that realize that the MTU of the path to A->B->C is 512 (taking a smaller value of 800 and 512), then the subcontracting is divided into 512 bytes and 488 bytes directly on the a host. In this way, only one segment is required, which reduces the overhead of the system.TCP and UDP are not aware of the fragmentation and reassembly process, but the application layer can understand.The Path MTU Discovery feature can discover the MTU (PMTU) of the entire path.The RFC also specifies tha

"WCF Technology Insider" translation 14:1th Part _ 3rd Chapter _ Message Exchange Mode, topology and choreography: Message Exchange Mode (MEP) 3rd Chapter: Message Exchange Mode, topology and choreography When designing a messaging application system, it is important to consider how messages flow through the sender, broker, and recipient (the message participants are described in the previous section). The value of the fluctuation of the possibility

tables hold two routing information. Routing tables for local addresses: routing tables that are closely related to the kernel for other addresses: User manual configuration, or routing protocol dynamic insertion.Route main action: Black Hole: Drop packet Unreachable: Drop packet, generate ICMP host unreachable message Forbidden: Discard packet, generate ICMP filtered message discard: Used in conjunction with Policy RoutingRoute cacheItems in the routing table can reach hundreds of thousands of

WCF Technical Insider 23:2nd Part _ 5th Chapter _ News: XmlDictionaryReader and return message XmlDictionaryReader type XmlDictionaryReader abstract types inherit from System.Xml.XmlReader, so many XmlReader attributes are inherited. Like XmlReader, XmlDictionaryReader defines several factory methods, and they return instances of XmlDictionaryReader subtypes. Rather, XmlDictionaryReader wraps a stream and defines a number of methods that begin with

JS are you interested in using JSP to construct the mail tool? If yes, then you come to the right place. This tutorial will demonstrate the underlying concepts behind the mail tool, including the HTML code that collects the email data, several key features of the JavaMail API, and how to integrate these features into the JSP. This javamail introductory tutorial includes an example of a successful implementation of JavaMail in JSP, and once mastered, JavaMail becomes a powerful API tool in the JS

requirements, more than half of the board members must be independent directors, so Baidu's board of directors before the structure has been met such a requirement, well access is not like many other enterprises, just play a "vase" role, He and other independent directors will truly contribute to the development of Baidu. For example, his influence in Japan is almost a myth, both in politics, in the corporate world and in ordinary Japanese people, who admire him. In addition, the extension of t

and compression capabilities. 1.3.6 Federated Storage Engine The Federated Storage Engine table does not hold data, it simply points to a table on a remote database server. 1.3.7 Maria Storage Engine Can be seen as a follow-up version of MyISAM. The Maria storage Engine features support for caching data and index files, application of row lock design, MVCC functionality, options to support things and non-transactional security, and better processing performance for BLOB character types. mysql

actual usage scenario. The best query conditions are consistent with the partitioning criteria.The list type partition is similar to the one that uses the values in (such as the hash value of the three-and-four values);When inserting a value that does not conform to a partition, the range and list partition types are the same, they are error-able to insert, and if you insert multiple data at one time, there is a difference between the different engines:INNODB will insert multiple inserts as a s

character to the corresponding UCS2 character.This section concludes with a description of the difference between binary strings and non-binary strings that use binary string collations .1. The binary string does not have the concept of a character set. It will be interpreted as a byte, and the comparison is a single-byte numeric code2. Non-binary strings that use binary collations are interpreted as characters and are compared to their numeric character values, which are usually calculated ba

byValExecution Result:Case-Search expression:SELECTOrderID, CustID, Val, Case whenVal 1000.00 Then ' less Then' whenValbetween 1000.00 and 3000.00 Then 'between' whenVal> 3000.00 Then 'More than' ELSE 'Unknown' END asvaluecategory fromSales.ordervalues;Execution Result:Sorting rulesIf you want the collation of a column to be case-insensitive, you can modify the collation of an expression as follows:SELECT Empid, FirstName, LastName fro

Document directory Delphi4 Programming Technology insider Delphi4 Programming Technology insider DelphiTutorial Series of books(110)《Delphi4Programming Technology insider Organize netizens (state)Email:Shuaihj@163.com : Download Original Title: Charlie Calvert's Delphi 4 unleashed Author: Charlie calvert Translator: Xiaoxiang Studio Series name: Software

In-depth analysis of Java Web Technology Insider Learning NotesIn the Java Virtual Machine specification, the Java Runtime data is divided into 6 types, where the domain is a member of the class, respectively:PC Register data: It is used to save the memory address of the currently executing program, the JVM specification defines only the Java method required to record pointer information, and for the native method, there is no need to record the exec

complete solution to bring convenient services to the Enterprise, I also realized the issues that need to be considered in this series of processes, not just a small email system last year. I remember that I had a post in the csdn Ma Ning Group, which sent a message to Microsoft. there are a lot of people in the NET Compact framework technology insider ebook. I noticed it a while ago and put it here by the way. I want to develop and master WM well. n

MySQL technology insider-InnoDB Storage engine-Reading Notes (2), mysql-innodbMySQL technology insider-InnoDB Storage engine-Reading Notes (2) Mysql is always indispensable for php development. Series blog link http://itsong.net/articles/466.htmlChapter 3 files: mysql and innodb files Parameter file, configuration path, initialization parameter, memory size, etc. Log files, including error logs, bin