diff options
Diffstat (limited to 'drivers/staging/ramzswap/ramzswap_drv.h')
| -rw-r--r-- | drivers/staging/ramzswap/ramzswap_drv.h | 67 |
1 files changed, 53 insertions, 14 deletions
diff --git a/drivers/staging/ramzswap/ramzswap_drv.h b/drivers/staging/ramzswap/ramzswap_drv.h index a6ea240935b6..c7e0e767c223 100644 --- a/drivers/staging/ramzswap/ramzswap_drv.h +++ b/drivers/staging/ramzswap/ramzswap_drv.h @@ -1,7 +1,7 @@ /* * Compressed RAM based swap device * - * Copyright (C) 2008, 2009 Nitin Gupta + * Copyright (C) 2008, 2009, 2010 Nitin Gupta * * This code is released using a dual license strategy: BSD/GPL * You can choose the licence that better fits your requirements. @@ -15,6 +15,9 @@ #ifndef _RAMZSWAP_DRV_H_ #define _RAMZSWAP_DRV_H_ +#include <linux/spinlock.h> +#include <linux/mutex.h> + #include "ramzswap_ioctl.h" #include "xvmalloc.h" @@ -71,15 +74,6 @@ static const unsigned max_zpage_size_nobdev = PAGE_SIZE / 4 * 3; #define SECTORS_PER_PAGE_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) #define SECTORS_PER_PAGE (1 << SECTORS_PER_PAGE_SHIFT) -/* Debugging and Stats */ -#if defined(CONFIG_RAMZSWAP_STATS) -#define stat_inc(stat) ((stat)++) -#define stat_dec(stat) ((stat)--) -#else -#define stat_inc(x) -#define stat_dec(x) -#endif - /* Flags for ramzswap pages (table[page_no].flags) */ enum rzs_pageflags { /* Page is stored uncompressed */ @@ -102,7 +96,7 @@ struct table { u16 offset; u8 count; /* object ref count (not yet used) */ u8 flags; -} __attribute__((aligned(4)));; +} __attribute__((aligned(4))); /* * Swap extent information in case backing swap is a regular @@ -121,9 +115,10 @@ struct ramzswap_stats { #if defined(CONFIG_RAMZSWAP_STATS) u64 num_reads; /* failed + successful */ u64 num_writes; /* --do-- */ - u64 failed_reads; /* can happen when memory is too low */ - u64 failed_writes; /* should NEVER! happen */ + u64 failed_reads; /* should NEVER! happen */ + u64 failed_writes; /* can happen when memory is too low */ u64 invalid_io; /* non-swap I/O requests */ + u64 notify_free; /* no. of swap slot free notifications */ u32 pages_zero; /* no. of zero filled pages */ u32 pages_stored; /* no. of pages currently stored */ u32 good_compress; /* % of pages with compression ratio<=50% */ @@ -138,6 +133,7 @@ struct ramzswap { void *compress_workmem; void *compress_buffer; struct table *table; + spinlock_t stat64_lock; /* protect 64-bit stats */ struct mutex lock; struct request_queue *queue; struct gendisk *disk; @@ -167,5 +163,48 @@ struct ramzswap { /*-- */ -#endif +/* Debugging and Stats */ +#if defined(CONFIG_RAMZSWAP_STATS) +static void rzs_stat_inc(u32 *v) +{ + *v = *v + 1; +} + +static void rzs_stat_dec(u32 *v) +{ + *v = *v - 1; +} + +static void rzs_stat64_inc(struct ramzswap *rzs, u64 *v) +{ + spin_lock(&rzs->stat64_lock); + *v = *v + 1; + spin_unlock(&rzs->stat64_lock); +} + +static void rzs_stat64_dec(struct ramzswap *rzs, u64 *v) +{ + spin_lock(&rzs->stat64_lock); + *v = *v - 1; + spin_unlock(&rzs->stat64_lock); +} + +static u64 rzs_stat64_read(struct ramzswap *rzs, u64 *v) +{ + u64 val; + + spin_lock(&rzs->stat64_lock); + val = *v; + spin_unlock(&rzs->stat64_lock); + + return val; +} +#else +#define rzs_stat_inc(v) +#define rzs_stat_dec(v) +#define rzs_stat64_inc(r, v) +#define rzs_stat64_dec(r, v) +#define rzs_stat64_read(r, v) +#endif /* CONFIG_RAMZSWAP_STATS */ +#endif |