/* * Request reply cache. This was heavily inspired by the * implementation in 4.3BSD/4.4BSD. * * Copyright (C) 1995, 1996 Olaf Kirch */ #ifndef NFSCACHE_H #define NFSCACHE_H #include /* * Representation of a reply cache entry. * * Note that we use a sockaddr_in6 to hold the address instead of the more * typical sockaddr_storage. This is for space reasons, since sockaddr_storage * is much larger than a sockaddr_in6. */ struct svc_cacherep { struct list_head c_lru; unsigned char c_state, /* unused, inprog, done */ c_type, /* status, buffer */ c_secure : 1; /* req came from port < 1024 */ struct sockaddr_in6 c_addr; __be32 c_xid; u32 c_prot; u32 c_proc; u32 c_vers; unsigned int c_len; __wsum c_csum; unsigned long c_timestamp; union { struct kvec u_vec; __be32 u_status; } c_u; }; #define c_replvec c_u.u_vec #define c_replstat c_u.u_status /* cache entry states */ enum { RC_UNUSED, RC_INPROG, RC_DONE }; /* return values */ enum { RC_DROPIT, RC_REPLY, RC_DOIT }; /* * Cache types. * We may want to add more types one day, e.g. for diropres and * attrstat replies. Using cache entries with fixed length instead * of buffer pointers may be more efficient. */ enum { RC_NOCACHE, RC_REPLSTAT, RC_REPLBUFF, }; /* * If requests are retransmitted within this interval, they're dropped. */ #define RC_DELAY (HZ/5) /* Cache entries expire after this time period */ #define RC_EXPIRE (120 * HZ) /* Checksum this amount of the request */ #define RC_CSUMLEN (256U) int nfsd_reply_cache_init(void); void nfsd_reply_cache_shutdown(void); int nfsd_cache_lookup(struct svc_rqst *); void nfsd_cache_update(struct svc_rqst *, int, __be32 *); int nfsd_reply_cache_stats_open(struct inode *, struct file *); #endif /* NFSCACHE_H */ ngs/power/r8a7743-sysc.h?id=9ff464db50e437eef131f719cc2e9902eea9c607'>treecommit diff

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author	Steven Rostedt (VMware) <rostedt@goodmis.org>	2017-01-30 19:27:10 -0500
committer	Steven Rostedt (VMware) <rostedt@goodmis.org>	2017-01-31 09:13:49 -0500
commit	79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree	370efda701f03cccf21e02bb1fdd3b852547d75c /net/ipv4/tcp_probe.c
parent	0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)

tracing: Fix hwlat kthread migration

The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

Diffstat (limited to 'net/ipv4/tcp_probe.c')