Alexander Duyck ffde7328a3 net: Split netdev_alloc_frag into __alloc_page_frag and add __napi_alloc_frag ... This patch splits the netdev_alloc_frag function up so that it can be used on one of two page frag pools instead of being fixed on the netdev_alloc_cache. By doing this we can add a NAPI specific function __napi_alloc_frag that accesses a pool that is only used from softirq context. The advantage to this is that we do not need to call local_irq_save/restore which can be a significant savings. I also took the opportunity to refactor the core bits that were placed in __alloc_page_frag. First I updated the allocation to do either a 32K allocation or an order 0 page. This is based on the changes in commmit d9b2938aa where it was found that latencies could be reduced in case of failures. Then I also rewrote the logic to work from the end of the page to the start. By doing this the size value doesn't have to be used unless we have run out of space for page fragments. Finally I cleaned up the atomic bits so that we just do an atomic_sub_and_test and if that returns true then we set the page->_count via an atomic_set. This way we can remove the extra conditional for the atomic_read since it would have led to an atomic_inc in the case of success anyway. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-12-10 13:31:57 -05:00
..
acpi	ACPI and power management updates for 3.18-rc2	2014-10-24 11:29:31 -07:00
asm-generic	Revert "fast_hash: avoid indirect function calls"	2014-11-14 16:36:25 -05:00
clocksource
crypto
drm	drm/radeon: remove invalid pci id	2014-10-28 10:44:36 -04:00
dt-bindings	The fixes for the clock framework are all regressions in drivers, plus a	2014-11-25 17:52:56 -08:00
keys
kvm
linux	net: Split netdev_alloc_frag into __alloc_page_frag and add __napi_alloc_frag	2014-12-10 13:31:57 -05:00
math-emu
media
memory
misc
net	Merge branch 'for-davem-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-10 13:17:23 -05:00
pcmcia
ras
rdma
rxrpc
scsi	scsi: set REQ_QUEUE for the blk-mq case	2014-10-28 09:53:43 +01:00
soc/tegra
sound	ALSA: pcm: Add big-endian DSD sample formats and fix XMOS DSD sample format	2014-11-21 15:13:28 +01:00
target
trace	Merge branch 'urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/urgent	2014-10-30 07:37:37 +01:00
uapi	bridge: remove mode BRIDGE_MODE_SWDEV	2014-12-09 18:24:47 -05:00
video
xen
Kbuild