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Linux 3.14 compat: IO acct, global_page_state, etc

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generic_start_io_acct/generic_end_io_acct in the master
branch of the linux kernel requires that the request_queue
be provided.

Move the logic from freemem in the spl to arc_free_memory
in arc.c. Do this so we can take advantage of global_page_state
interface checks in zfs.

Upstream kernel replaced struct block_device with
struct gendisk in struct bio. Determine if the
function bio_set_dev exists during configure
and have zfs use that if it exists.

bio_set_dev https://github.com/torvalds/linux/commit/74d4699
global_node_page_state https://github.com/torvalds/linux/commit/75ef718
io acct https://github.com/torvalds/linux/commit/d62e26b

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Closes #6635
This commit is contained in:
Giuseppe Di Natale
2017-09-16 11:00:19 -07:00
committed by Brian Behlendorf
parent 90cdf2833d
commit 787acae0b5
7 changed files with 112 additions and 19 deletions
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module/zfs/arc.c
+20 -2
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@@ -4665,6 +4665,24 @@ arc_all_memory(void)
#endif
}
#ifdef _KERNEL
static uint64_t
arc_free_memory(void)
{
#ifdef ZFS_GLOBAL_NODE_PAGE_STATE
return (nr_free_pages() +
global_node_page_state(NR_INACTIVE_FILE) +
global_node_page_state(NR_INACTIVE_ANON) +
global_node_page_state(NR_SLAB_RECLAIMABLE));
#else
return (nr_free_pages() +
global_page_state(NR_INACTIVE_FILE) +
global_page_state(NR_INACTIVE_ANON) +
global_page_state(NR_SLAB_RECLAIMABLE));
#endif
}
#endif
typedef enum free_memory_reason_t {
FMR_UNKNOWN,
FMR_NEEDFREE,
@@ -4701,7 +4719,7 @@ arc_available_memory(void)
int64_t lowest = INT64_MAX;
free_memory_reason_t r = FMR_UNKNOWN;
#ifdef _KERNEL
uint64_t available_memory = ptob(freemem);
uint64_t available_memory = ptob(arc_free_memory());
int64_t n;
#ifdef __linux__
pgcnt_t needfree = btop(arc_need_free);
@@ -6904,7 +6922,7 @@ static int
arc_memory_throttle(uint64_t reserve, uint64_t txg)
{
#ifdef _KERNEL
uint64_t available_memory = ptob(freemem);
uint64_t available_memory = ptob(arc_free_memory());
static uint64_t page_load = 0;
static uint64_t last_txg = 0;
#ifdef __linux__