forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

RDS: Use page_remainder_alloc() for recv bufs

Browse source 
Instead of splitting up a page into RDS_FRAG_SIZE chunks
ourselves, ask rds_page_remainder_alloc() to do it. While it
is possible PAGE_SIZE > FRAG_SIZE, on x86en it isn't, so having
duplicate "carve up a page into buffers" code seems excessive.

The other modification this spawns is the use of a single
struct scatterlist in rds_page_frag instead of a bare page ptr.
This causes verbosity to increase in some places, and decrease
in others.

Finally, I decided to unify the lifetimes and alloc/free of
rds_page_frag and its page. This is a nice simplification in itself,
but will be extra-nice once we come to adding cmason's recycling
patch.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover 2010-05-24 20:12:41 -07:00
parent fc19de38be
commit 0b088e003c
3 changed files with 29 additions and 73 deletions
Download patch file Download diff file Expand all files Collapse all files

7
net/rds/ib.h
View file

@ -28,13 +28,9 @@ extern struct list_head rds_ib_devices;
* try and minimize the amount of memory tied up both the device and
* socket receive queues.
*/
/* page offset of the final full frag that fits in the page */
#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
struct rds_page_frag {
struct list_head f_item;
struct page *f_page;
unsigned long f_offset;
dma_addr_t f_mapped;
struct scatterlist f_sg;
};
struct rds_ib_incoming {
@ -107,7 +103,6 @@ struct rds_ib_connection {
struct rds_header *i_recv_hdrs;
u64 i_recv_hdrs_dma;
struct rds_ib_recv_work *i_recvs;
struct rds_page_frag i_frag;
u64 i_ack_recv; /* last ACK received */
/* sending acks */