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Merge pull request #36 from jvbronzeado/rewrite

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Optimize page fault handling by caching last accessed range
This commit is contained in:
Matheus
2026-10-08 15:39:12 -03:00
committed by GitHub
parent de3633f5e1 185b33e719
commit e25008b80b
3 changed files with 28 additions and 3 deletions
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kernel-src/mm/mm.c
+15 -2
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@@ -273,7 +273,13 @@ bool mm_handle_page_fault(void *addr, bool user, int actions) {
}
MUTEX_ACQUIRE(&space->lock);
mm_range_t *range = mm_get_range(space, addr);
// we look at the last page fault range and check if the address is in this range
// this might avoid a more expensive tree lookup
mm_range_t *range = space->last_pagefault;
if (range == NULL || range->start > addr || addr >= range->start + range->size) {
range = mm_get_range(space, addr);
}
bool status = false;
@@ -282,6 +288,8 @@ bool mm_handle_page_fault(void *addr, bool user, int actions) {
goto cleanup;
}
space->last_pagefault = range;
// check if valid
int invalid_actions = 0;
@@ -487,8 +495,12 @@ void *mm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags, v
mm_insert_range(space, range);
cleanup:
if (ret_addr == NULL && range)
if (ret_addr == NULL && range) {
if (space->last_pagefault == range)
space->last_pagefault = NULL;
mm_free_range(range);
}
MUTEX_RELEASE(&space->lock);
return ret_addr;
@@ -548,6 +560,7 @@ mm_context_t *mm_create_context() {
return NULL;
}
ctx->space.last_pagefault = NULL;
return ctx;
}